1. Közösség
2. Content Requests and Feedback
3. Add Study Skills course

I very much agree, Khan Academy is such a great resource, so much knowledge and skills to acquire here, but retaining and mastering them all can become a challenge, a section on study/learning/memo...

1. Közösség
2. Content Requests and Feedback
3. statistics & design of experiments

Hello, I am not sure if that is what you are looking for exactly, but there is a video titled "Introduction to experimental design"  maybe you are looking for something more advanced or elaborated ...