AMAZING, one to two week's worth of double sided worksheets. You get six double sided worksheets that cover variance, standard deviation, normal distribution, scatter plots & correlation. Plus, a quiz and a fun worksheet for students to work on when done with the quiz. Some of the worksheets have answer keys and the quiz has an answer key. My entire math department uses these instead of using the books. This is all you need to teach these concepts, and they're great. Please, check out my other worksheets.