Content Update: February 2018 (US Government, Biology, Stats, Careers and more!)

This month we added a ton of new AP US Government, High School Biology, Statistics, Career content, and more! Check it all out below and learn what it takes to be a Yacht Captain or Veterinarian.

Domain	Subject	Title	Content kind	URL
Arts and humanities	AP US Government and Politics	Challenges of the Articles of Confederation	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/challenges-of-the-articles-of-confederation/e/challenges-of-the-articles-of-confederation-quiz
Arts and humanities	AP US Government and Politics	Lesson summary: challenges of the Articles of Confederation	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/challenges-of-the-articles-of-confederation/a/challenges-of-the-articles-of-confederation-lesson-overview
Arts and humanities	AP US Government and Politics	Constitutional interpretations of federalism	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/e/constitutional-interpretations-of-federalism-
Arts and humanities	AP US Government and Politics	McCulloch v. Maryland (1819)	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/a/mcculloch-v-maryland-1819
Arts and humanities	AP US Government and Politics	US v. Lopez (1995)	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/a/us-v-lopez-1995
Arts and humanities	AP US Government and Politics	Lesson summary: Constitutional interpretations of federalism	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/a/constitutional-interpretations-of-federalism-lesson-overview
Arts and humanities	AP US Government and Politics	Enumerated and implied powers of the US federal government	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/v/enumerated-and-implied-powers-of-the-us-federal-government
Arts and humanities	AP US Government and Politics	McCulloch v. Maryland	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/v/mcculloch-vs-maryland
Arts and humanities	AP US Government and Politics	Federal and state powers and the 10th and 14th Amendments	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/v/federal-and-state-powers-and-the-10th-and-14th-amendments
Arts and humanities	AP US Government and Politics	Unites States v. Lopez	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/constitutional-interpretations-of-federalism/v/unites-states-v-lopez
Arts and humanities	AP US Government and Politics	Foundations of American democracy unit review	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/federalism-in-action/a/unit-1-review
Arts and humanities	AP US Government and Politics	Federalism in action	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/federalism-in-action/e/federalism-in-action
Arts and humanities	AP US Government and Politics	Introduction to the public policy process	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/federalism-in-action/v/introduction-to-the-public-policy-process
Arts and humanities	AP US Government and Politics	Government power and individual rights	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/government-power-and-individual-rights/e/government-power-and-individual-rights-exercise
Arts and humanities	AP US Government and Politics	Lesson summary: government power and individual rights	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/government-power-and-individual-rights/a/government-power-and-individual-rights-lesson-overview
Arts and humanities	AP US Government and Politics	Federalist Papers #10 (part 1)	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/government-power-and-individual-rights/v/federalist-papers-10-part-1
Arts and humanities	AP US Government and Politics	Anti Federalists and Brutus I	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/government-power-and-individual-rights/v/anti-federalists-and-brutus-i
Arts and humanities	AP US Government and Politics	Federalist Papers #10 (part 2)	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/government-power-and-individual-rights/v/federalist-papers-10-part-2
Arts and humanities	AP US Government and Politics	The Preamble to the Constitution	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ideals-of-democracy/v/preamble
Arts and humanities	AP US Government and Politics	Ideals of democracy	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ideals-of-democracy/e/ideals-of-democracy-exercise
Arts and humanities	AP US Government and Politics	Lesson summary: ideals of democracy	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ideals-of-democracy/a/ideals-of-democracy-lesson-overview
Arts and humanities	AP US Government and Politics	The ideas at the heart of US government	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ideals-of-democracy/a/the-ideas-at-the-heart-of-us-government
Arts and humanities	AP US Government and Politics	Principles of American government	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/principles-of-american-government/a/principles-of-american-government-article
Arts and humanities	AP US Government and Politics	Principles of American government	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/principles-of-american-government/e/principles-of-american-government
Arts and humanities	AP US Government and Politics	Lesson summary: principles of American government	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/principles-of-american-government/a/principles-of-american-government-lesson-overview
Arts and humanities	AP US Government and Politics	Impeachment	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/principles-of-american-government/v/impeachment
Arts and humanities	AP US Government and Politics	Multiple points of influence due to separation of powers and checks and balances	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/principles-of-american-government/v/multiple-points-of-influence-due-to-separation-of-powers-and-checks-and-balances
Arts and humanities	AP US Government and Politics	Article V and the amendment process	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ratification-of-the-us-constitution/a/article-v-and-the-amendment-process
Arts and humanities	AP US Government and Politics	Lesson summary: ratification of the US Constitution	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ratification-of-the-us-constitution/a/ratification-of-the-us-constitution-lesson-overview
Arts and humanities	AP US Government and Politics	The impact of Constitutional compromises on us today	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/ratification-of-the-us-constitution/v/impact-of-constitutional-compromise-on-us-today
Arts and humanities	AP US Government and Politics	Relationship between the states and the federal government	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/relationship-between-states-and-the-federal-government/a/relationship-between-the-states-and-the-federal-government-article
Arts and humanities	AP US Government and Politics	The relationship between the states and the federal government	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/relationship-between-states-and-the-federal-government/e/the-relationship-between-the-states-and-the-federal-government-quiz
Arts and humanities	AP US Government and Politics	Lesson summary: the relationship between the states and the federal government	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/relationship-between-states-and-the-federal-government/a/relationship-between-the-states-and-the-federal-government-lesson-overview
Arts and humanities	AP US Government and Politics	Federalism in the United States	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/relationship-between-states-and-the-federal-government/v/federalism-in-the-united-states
Arts and humanities	AP US Government and Politics	Types of democracy	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/types-of-democracy/a/types-of-democracy
Arts and humanities	AP US Government and Politics	Lesson summary: types of democracy	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/types-of-democracy/a/types-of-democracy-lesson-overview
Arts and humanities	AP US Government and Politics	Types of democracy	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/types-of-democracy/e/types-of-democracy-exercise
Arts and humanities	AP US Government and Politics	Article I of the Constitution	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congress-the-senate-and-the-house-of-representatives/v/article-i-of-the-constitution
Arts and humanities	AP US Government and Politics	Congress: The Senate and the House of Representatives	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congress-the-senate-and-the-house-of-representatives/e/congress--the-senate-and-the-house-of-representatives-
Arts and humanities	AP US Government and Politics	Congressional behavior	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congressional-behavior/e/congressional-behavior
Arts and humanities	AP US Government and Politics	Representatives as delegates, trustees and politicos	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congressional-behavior/v/representatives-as-delegates-trustees-and-politicos
Arts and humanities	AP US Government and Politics	Gerrymandering	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congressional-behavior/v/gerrymandering
Arts and humanities	AP US Government and Politics	Article II of the Constitution	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/v/article-ii-of-the-constitution
Arts and humanities	AP US Government and Politics	Presidential signing statements	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/v/presidential-signing-statements
Arts and humanities	AP US Government and Politics	Executive orders	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/v/executive-orders
Arts and humanities	AP US Government and Politics	Formal and informal powers of the US President	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/v/formal-and-informal-powers-of-the-us-president
Arts and humanities	AP US Government and Politics	Lesson summary: Roles and powers of the president	Article	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/a/roles-and-powers-of-the-president-lesson-overview
Arts and humanities	AP US Government and Politics	Roles and powers of the president	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/roles-and-powers-of-the-president/e/roles-and-powers-of-the-president-questions
Arts and humanities	AP US Government and Politics	Structures, powers, and functions of Congress	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/e/structures--powers--and-functions-of-congress
Arts and humanities	AP US Government and Politics	How a bill becomes a law	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/v/how-a-bill-becomes-a-law
Arts and humanities	AP US Government and Politics	Senate filibusters, unanimous consent and cloture	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/v/senate-filibusters-unanimous-consent-and-cloture
Arts and humanities	AP US Government and Politics	Discretionary and mandatory outlays of the US federal government	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/v/discretionary-and-mandatory-outlays-of-the-us-federal-government
Arts and humanities	AP US Government and Politics	Earmarks, pork barrel projects and logrolling	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/v/earmarks-pork-barrel-projects-and-logrolling
Arts and humanities	AP US Government and Politics	The House of Represenatives in comparison to the Senate	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/v/the-house-of-represenatives-in-comparison-to-the-senate
Arts and humanities	AP US Government and Politics	Article III of the Constitution	Video	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-judicial-branch/v/article-iii-of-the-constitution
Arts and humanities	AP US Government and Politics	The judicial branch	Exercise	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-judicial-branch/e/the-judicial-branch-questions
Arts and humanities	Art history basics	Light and Shadow	Video	http://www.khanacademy.org/humanities/art-history-basics/tools-understanding-art/v/light-and-shadow
Arts and humanities	Art of the Americas to World War I	Pride and anxiety in New Spain: Francisco Clapera, set of sixteen Casta paintings, c. 1775	Video	http://www.khanacademy.org/humanities/art-americas/new-spain/viceroyalty-new-spain/v/clapera-casta-paintings
Arts and humanities	Modernisms 1900-1980	When the department store was new: Elizabeth Sparhawk-Jones, The Shoe Shop	Video	http://www.khanacademy.org/humanities/art-1010/art-between-wars/american-art-wwii/v/sparhawk-jones-shoe-shop
Arts and humanities	Special topics in art history	Scientific research glossary of terms	Video	http://www.khanacademy.org/humanities/special-topics-art-history/creating-conserving/what-is-conservation/v/scientific-research-glossary-of-terms
College, careers, and more	Careers	Commercial real estate advisor: How I got my job and where I'm going	Video	http://www.khanacademy.org/college-careers-more/career-content/advertise-and-sell/commercial-real-estate-advisor/v/barton-commercial-real-estate-advisor-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Commercial real estate advisor: What I do and how much I make	Video	http://www.khanacademy.org/college-careers-more/career-content/advertise-and-sell/commercial-real-estate-advisor/v/barton-commercial-real-estate-advisor-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Commercial real estate advisor: My budget and planning for the future	Video	http://www.khanacademy.org/college-careers-more/career-content/advertise-and-sell/commercial-real-estate-advisor/v/barton-commercial-real-estate-advisor-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Outdoor education professional: Working as an outdoor educator	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-working-as-an-outdoor-educator
College, careers, and more	Careers	Outdoor education professional: My budget and planning for the future	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-outreach-and-admissions-coordinator-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Outdoor education professional: Requirements to become an outdoor educator	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-becoming-an-outdoor-educator
College, careers, and more	Careers	Outdoor education professional: How I got my job and where I'm going	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-outreach-and-admissions-coordinator-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Outdoor education professional: What I do and how much I make	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-outreach-and-admissions-coordinator-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Outdoor education professional: Making ends meet as an outdoor educator	Video	http://www.khanacademy.org/college-careers-more/career-content/educate/outreach-and-admissions-coordinatoroutdoor-educator/v/sienna-making-ends-meet-as-an-outdoor-educator
College, careers, and more	Careers	Veterinarian: How I got my job and where I'm going	Video	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/veterinarian/v/betsy-veterinarian-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Veterinarian: What I do and how much I make	Video	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/veterinarian/v/betsy-veterinarian-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Veterinarian: My budget and planning for the future	Video	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/veterinarian/v/betsy-veterinarian-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Yacht captain: My budget and planning for the future	Video	http://www.khanacademy.org/college-careers-more/career-content/travel-and-explore/yacht-captain/v/chris-yacht-captain-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Yacht captain: What I do and how much I make	Video	http://www.khanacademy.org/college-careers-more/career-content/travel-and-explore/yacht-captain/v/chris-yacht-captain-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Yacht caption: How I got my job and where I'm going	Video	http://www.khanacademy.org/college-careers-more/career-content/travel-and-explore/yacht-captain/v/chris-yacht-captain-how-i-got-my-job-and-where-im-going
Economics and finance	AP Macroeconomics	Limitations of GDP	Video	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/economic-iondicators-and-the-business-cycle/limitations-of-gdp/v/limitations-of-gdp-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Expenditure approach to calculating GDP examples	Video	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/economic-iondicators-and-the-business-cycle/21/v/expenditure-approach-to-calculating-gdp-examples-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Natural, cyclical, structural and frictional unemployment rates	Video	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/economic-iondicators-and-the-business-cycle/unemployment/v/natural-cyclical-structural-and-frictional-unemployment-rates-khan-academy
Math	8th grade	Determine rotations (basic)	Exercise	http://www.khanacademy.org/math/cc-eighth-grade-math/geometric-transformations/rotations-8th/e/determine-rotations--basic-
Math	8th grade	Rotate points (basic)	Exercise	http://www.khanacademy.org/math/cc-eighth-grade-math/geometric-transformations/rotations-8th/e/rotate-points--basic-
Math	Multivariable calculus	Derivatives of multivariable functions review practice	Exercise	http://www.khanacademy.org/math/multivariable-calculus/multivariable-derivatives/multivariable-derivatives-review/e/skill-check--partial-derivatives
Math	Multivariable calculus	Thinking about multivariable functions review practice	Exercise	http://www.khanacademy.org/math/multivariable-calculus/thinking-about-multivariable-function/thinking-about-multivariable-function-review/e/skill-check--visualizing-functions
Math	Statistics and probability	Making a t interval for paired data	Article	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/a/one-sample-t-interval-paired-data
Math	Statistics and probability	Interpreting a confidence interval for a mean	Article	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/a/interpret-one-sample-t-interval-mean
Math	Statistics and probability	Conditions for valid t intervals	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/conditions-for-valid-t-intervals
Math	Statistics and probability	Example finding critical t value	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/example-finding-critical-t-value
Math	Statistics and probability	Example constructing a t interval for a mean	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/calculating-a-one-sample-t-interval-for-a-mean
Math	Statistics and probability	Confidence interval for a mean with paired data	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/confidence-interval-for-a-mean-difference
Math	Statistics and probability	Introduction to t statistics	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/introduction-to-t-statistics
Math	Statistics and probability	Simulation showing value of t statistic	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/simulation-showing-value-of-t-statistic
Math	Statistics and probability	Sample size for a given margin of error for a mean	Video	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/v/sample-size-for-a-given-margin-of-error-for-a-mean
Math	Statistics and probability	Conditions for a t interval for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/e/conditions-one-sample-t-interval-mean
Math	Statistics and probability	Finding the critical value t* for a desired confidence level	Exercise	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/e/finding-critical-value-t
Math	Statistics and probability	Calculating a t interval for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/e/calculating-one-sample-t-interval-mean
Math	Statistics and probability	Sample size and margin of error in a confidence interval for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/e/sample-size-margin-error-one-sample-t-interval-mean
Math	Statistics and probability	Reference: Conditions for inference on a mean	Article	http://www.khanacademy.org/math/ap-statistics/estimating-confidence-ap/one-sample-t-interval-mean/a/reference-conditions-inference-one-mean
Math	Statistics and probability	Error probabilities and power	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/e/error-probabilities-power
Math	Statistics and probability	Type I vs Type II error	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/e/type-i-error-type-ii-error-power
Math	Statistics and probability	Examples identifying Type I and Type II errors	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/v/examples-identifying-type-i-and-type-ii-errors
Math	Statistics and probability	Introduction to Type I and Type II errors	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/v/introduction-to-type-i-and-type-ii-errors
Math	Statistics and probability	Introduction to power in significance tests	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/v/introduction-to-power-in-significance-tests
Math	Statistics and probability	Examples thinking about power in significance tests	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/v/examples-thinking-about-power-in-significance-tests
Math	Statistics and probability	Conditions for a t test about a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/e/checking-conditions-one-sample-t-test-mean
Math	Statistics and probability	Writing hypotheses for a test about a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/e/writing-hypotheses-one-sample-t-test-mean
Math	Statistics and probability	Calculating the test statistic in a t test for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/e/test-statistic-t-test
Math	Statistics and probability	Making conclusions in a t test for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/e/conclusions-one-sample-t-test-mean
Math	Statistics and probability	Calculating the P-value in a t test for a mean	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/e/p-value-t-test-mean
Math	Statistics and probability	Example calculating t statistic for a test about a mean	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/example-calculating-t-statistic-for-signficance-test
Math	Statistics and probability	Comparing P-value from t statistic to significance level	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/comparing-p-value-from-t-statistic-to-significance-level
Math	Statistics and probability	Free response example: Significance test for a mean	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/ap-statistics-free-response-on-significance-test-for-mean
Math	Statistics and probability	Writing hypotheses for a significance test about a mean	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/writing-hypotheses-for-significance-test-about-means
Math	Statistics and probability	Using TI calculator for P-value from t statistic	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/using-ti-calculator-for-p-value-from-t-statistic
Math	Statistics and probability	Using a table to estimate P-value from t statistic	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/calculating-p-value-from-t-statistic
Math	Statistics and probability	When to use z or t statistics in significance tests	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/when-to-use-z-or-t-statistics-in-significance-tests
Math	Statistics and probability	Conditions for a t test about a mean	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-t-test-mean/v/conditions-t-test-mean
Math	Statistics and probability	Writing hypotheses for a test about a proportion	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/e/writing-hypotheses-one-sample-z-test-proportion
Math	Statistics and probability	Conditions for a z test about a proportion	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/e/checking-conditions-one-sample-z-test-proportion
Math	Statistics and probability	Calculating the test statistic in a z test for a proportion	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/e/test-stat-one-sample-z-test-p
Math	Statistics and probability	Calculating the P-value in a z test for a proportion	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/e/p-value-one-sample-z-test-p
Math	Statistics and probability	Making conclusions in a z test for a proportion	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/e/conclusions-one-sample-z-test-proportion
Math	Statistics and probability	Calculating a z statistic in a test about a proportion	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/calculating-a-z-statistic-in-a-significance-test
Math	Statistics and probability	Calculating a P-value given a z statistic	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/calculating-p-value-from-z-table
Math	Statistics and probability	Constructing hypotheses for a significance test about a proportion	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/constructing-hypotheses-for-a-significance-test
Math	Statistics and probability	Making conclusions in a test about a proportion	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/comparing-p-value-to-significance-level-example
Math	Statistics and probability	Conditions for a z test about a proportion	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/conditions-for-a-z-test-about-a-proportion
Math	Statistics and probability	Writing null and alternative hypotheses	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/e/writing-null-and-alternative-hypotheses-informal
Math	Statistics and probability	Using P-values to make conclusions	Article	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/a/p-value-conclusions
Math	Statistics and probability	Estimating P-values from simulations	Exercise	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/e/estimating-p-values-and-making-conclusions
Math	Statistics and probability	Estimating a P-value from a simulation	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/v/estimating-p-value-from-simulation
Math	Statistics and probability	Examples of null and alternative hypotheses	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/v/examples-of-null-and-alternative-hypotheses
Math	Statistics and probability	P-values and significance tests	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/v/p-values-and-significance-tests
Math	Statistics and probability	Comparing P-values to different significance levels	Video	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/idea-significance-tests/v/comparing-p-value-diff-significance-levels
Partner content	The National Constitution Center	Article VI of the Constitution	Video	http://www.khanacademy.org/prometheus/gopo-powerrangers/ncc-video-staging-area/v/article-vi-of-the-constitution
Partner content	The National Constitution Center	Article IV of the Constitution	Video	http://www.khanacademy.org/prometheus/gopo-powerrangers/ncc-video-staging-area/v/article-iv-of-the-constitution
Partner content	The National Constitution Center	Article V of the Constitution	Video	http://www.khanacademy.org/prometheus/gopo-powerrangers/ncc-video-staging-area/v/article-v-of-the-constitution
Science	High school biology	Introduction to the cell	Video	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-basic-cell-structures/v/introduction-to-the-cell
Science	High school biology	Introduction to cilia, flagella and pseudopodia	Video	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-basic-cell-structures/v/introduction-to-cilia-flagella-and-pseudopodia
Science	High school biology	Basic cell structures	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-basic-cell-structures/e/cell-structures
Science	High school biology	Identifying cell structures	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-basic-cell-structures/e/identifying-cell-structures
Science	High school biology	Eukaryotic cell structures	Article	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-eukaryotic-cell-structures/a/hs-eukaryotic-cell-structures
Science	High school biology	Organelles in eukaryotic cells	Video	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-eukaryotic-cell-structures/v/organelles-in-eukaryotic-cells
Science	High school biology	Eukaryotic cell structures	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-eukaryotic-cell-structures/e/hs-eukaryotic-cell-structures
Science	High school biology	Identifying eukaryotic cell structures	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-eukaryotic-cell-structures/e/identifying-eukaryotic-cell-structures
Science	High school biology	Intro to cells	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-introduction-to-cells/e/intro-to-cells
Science	High school biology	Plant vs animal cells	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-plant-vs-animal-cells/e/plant-vs-animal-cells
Science	High school biology	Plant vs animal cells	Article	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-plant-vs-animal-cells/a/hs-plant-vs-animal-cells
Science	High school biology	Prokaryotes and eukaryotes	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-prokaryotes-and-eukaryotes/e/prokaryotes-and-eukaryotes
Science	High school biology	Prokaryotes and eukaryotes	Article	http://www.khanacademy.org/science/high-school-biology/hs-cells/hs-prokaryotes-and-eukaryotes/a/hs-prokaryotes-and-eukaryotes
Science	High school biology	Introduction to passive and active transport	Video	http://www.khanacademy.org/science/high-school-biology/hs-cellular-transport/hs-passive-and-active-transport/v/introduction-to-passive-and-active-transport
Science	High school biology	Active transport	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cellular-transport/hs-passive-and-active-transport/e/hs-active-transport
Science	High school biology	Passive transport	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cellular-transport/hs-passive-and-active-transport/e/hs-passive-transport
Science	High school biology	Passive transport	Article	http://www.khanacademy.org/science/high-school-biology/hs-cellular-transport/hs-passive-and-active-transport/a/hs-passive-transport
Science	High school biology	The cell membrane	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-cellular-transport/hs-the-cell-membrane/e/cell-membrane-and-homeostasis
Science	High school biology	Biological macromolecules	Article	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-biological-macromolecules/a/hs-biological-macromolecules
Science	High school biology	Biological macromolecules	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-biological-macromolecules/e/biological-macromolecules
Science	High school biology	Introduction to pH	Video	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-ph-acids-and-bases/v/introduction-to-ph
Science	High school biology	pH, acids, and bases	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-ph-acids-and-bases/e/ph
Science	High school biology	pH, acids, and bases	Article	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-ph-acids-and-bases/a/hs-ph-acids-and-bases
Science	High school biology	Introduction to vitamins and minerals	Video	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-vitamins-and-minerals/v/introduction-to-vitamins-and-minerals
Science	High school biology	Vitamins and minerals	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-vitamins-and-minerals/e/vitamins-and-minerals
Science	High school biology	Vitamins and minerals	Article	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-vitamins-and-minerals/a/hs-vitamins-and-minerals
Science	High school biology	Water and life	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-water-and-life/e/water-and-life
Science	High school biology	Water and life	Article	http://www.khanacademy.org/science/high-school-biology/hs-chemistry-of-life/hs-water-and-life/a/hs-water-and-life
Science	High school biology	Enzymes	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-energy-and-metabolism/hs-enzymes/e/hs-enzymes
Science	High school biology	Introduction to metabolism	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-energy-and-metabolism/hs-introduction-to-metabolism/e/introduction-to-metabolism
Science	High school biology	Photosynthesis	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-energy-and-metabolism/photosynthesis-and-cellular-respiration/e/hs-photosynthesis
Science	High school biology	Cellular respiration	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-energy-and-metabolism/photosynthesis-and-cellular-respiration/e/hs-cellular-respiration
Science	High school biology	Body structure and homeostasis	Article	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-body-structure-and-homeostasis/a/hs-body-structure-and-homeostasis
Science	High school biology	The circulatory system	Article	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-circulatory-and-respiratory-systems/a/hs-the-circulatory-system
Science	High school biology	The respiratory system	Article	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-circulatory-and-respiratory-systems/a/hs-the-respiratory-system
Science	High school biology	The circulatory and respiratory systems	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-circulatory-and-respiratory-systems/e/hs-the-circulatory-and-respiratory-systems
Science	High school biology	Chromosome structure and numbers	Article	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-chromosome-structure-and-numbers/a/hs-chromosome-structure-and-numbers
Science	High school biology	Human fertilization and early development	Video	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-fertilization-and-development/v/human-fertilization-and-early-development
Science	High school biology	Fertilization and development	Article	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-fertilization-and-development/a/hs-fertilization-and-development
Science	High school biology	Fertilization and development	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-fertilization-and-development/e/hs-fertilization-and-development
Science	High school biology	Meiosis	Article	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-meiosis/a/hs-meiosis
Science	High school biology	The cell cycle and mitosis	Article	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-the-cell-cycle-and-mitosis/a/hs-the-cell-cycle-and-mitosis
Science	High school biology	The cell cycle and mitosis	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-the-cell-cycle-and-mitosis/e/hs-the-cell-cycle-and-mitosis
Science	High school biology	Types of reproduction	Article	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-types-of-reproduction/a/hs-types-of-reproduction
Science	High school biology	Types of reproduction	Exercise	http://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-types-of-reproduction/e/types-of-reproduction

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