I had a hard time coming up with a candy activity for bivariate data that was really good. I ended up kind of cheating, and wrote an activity that has students gather *lots* of data points, one of which is “how many jelly beans can you pick up in one no-palm pinch?” and then letting them check the correlation of that with any of a wide variety of data points (height, hair length, finger length, age in days, etc.).

I don’t think it is as good, or will allow for quite as deep a discussion, as the earlier activities, but it is still decent I think.

I still haven’t actually taught regression inference, so I’m using this activity right after a brief mini-lesson on interpreting and using computer output for regression inference. I definitely will not be tackling this topic at the depth our book does; will focus instead on practicality and the basic idea of extending our knowledge of T-tests and confidence intervals to a more uncharted area. Some of the data sets they decide to plot will probably NOT satisfy all of the conditions for regression inference, though, so that could lead to a good discussion.

You can find all of my AP Stat candy activities, including this one (forgive any typos, it was made very late last night) here: https://drive.google.com/open?id=0B-C-lUvv4rQ4ZG9hcnh1azdHNjQ&authuser=0