Cyrus- Thank you so much for your response.  I am familiar with the mastery system, and I reread all the articles that you sent.  However, I did not see anything that would identify which skills ha...

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2. Feature Requests and General Site Feedback
3. Report Request - ID Common "Struggling Skills"

Or these: https://www.khanacademy.org/math/ap-statistics/prepare-for-the-2018-ap-statistics-exam I agree though, there are currently far fewer free response resources for AP Stats than AP Calc.  

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2. Content Requests and Feedback
3. OHQ: AP Statistics Free response questions

Great question!  I do not know the schedule for creating additional content, but I can make sure I forward this to see if someone else knows.  Sorry!

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2. Content Requests and Feedback
3. OHQ: AP Statistics Free response questions

I believe this problem has been solved.  If a student changes their username, it will not change their student name in your teacher account.  Additionally, you can still see the new name in your ac...

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2. Classroom Tips and Tricks
3. Changing the display name in the roster

It shows up just on the teacher screen.  Students cannot see it.  However, you will see their original username next to their e-mail in your roster screen.  

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2. Classroom Tips and Tricks
3. Changing the display name in the roster

Additionally, you could copy and paste your student's e-mail addresses from your Roster tab into an e-mail.  Remember, when you assign something new, your students are notified via e-mail automatic...

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2. Classroom Product Questions and Feedback
3. Sending message to students directly from khan academy

Great link!  Thanks for sharing; I've often wondered this myself!

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3. Why decimals begins with tenths not oneths?