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# Course Updates for High School Statistics in July 2021

Updated

We are excited to share that we've made significant enhancements to our High School Statistics course. One consequence of adding this new content is that it may impact learners’ Mastery percentages.

When we add new content and remove old content, Mastery percentages often change because the number of available skills changes. For example, if you mastered 90 out of 100 skills in a course, and we added 10 new skills, your mastery skill count would then be 90 out of 110. This change would change your Mastery percentage from 90% to 82%.

With this specific course update, we expect that Mastery percentages will change by a maximum of 65%. Most people will see a much smaller Mastery percentage change.

You can see exactly what content items we’ve added and removed below. Happy learning!

Articles

Exercises

Videos

### Content Removed

Articles

 Comparing range and interquartile range (IQR) The idea of spread and standard deviation Calculating standard deviation step by step Two-way frequency tables Two-way relative frequency tables and associations Positive and negative associations in scatterplots Samples and surveys Observational studies and experiments Probability: the basics Theoretical and experimental probability: Coin flips and die rolls Expected value (basic) Binomial probability (basic)

Exercises

 Shape of distributions Mean, median, and mode Missing value given the mean Standard deviation of a population Create two-way relative frequency tables Constructing scatter plots Making appropriate scatter plots Positive and negative linear associations from scatter plots Describing trends in scatter plots Valid claims Making inferences from random samples Types of statistical studies Simple probability Experimental probability Making predictions with probability Comparing probabilities Probability models Adding probabilities Probabilities of compund events Independent probability Dependent probability The counting principle

Videos

 Shapes of distributions Mean, median, & mode example Missing value given the mean Impact on median & mean: removing an outlier Impact on median & mean: increasing an outlier Effects of shifting, adding, & removing a data point Measures of spread: range, variance & standard deviation Constructing a box plot Comparing distributions with dot plots (example problem) Interpreting a trend line Constructing a scatter plot Example of direction in scatterplots Reasonable samples Types of statistical studies Appropriate statistical study example Intro to theoretical probability Simple probability: yellow marble Simple probability: non-blue marble Experimental probability Theoretical and experimental probabilities Making predictions with probability Intuitive sense of probabilities Probability models example: frozen yogurt Free-throw probability Independent & dependent probability Dependent probability: coins Counting outcomes: flower pots Count outcomes using tree diagram Probability with counting outcomes Example: All the ways you can flip a coin Example: Combinatorics and probability Binomial probability example Generalizing k scores in n attempts Free throw binomial probability distribution Graphing basketball binomial distribution