Statistics help, please.

[reallytrying]

:bugeye:
I'm working on regression. Here's the question.

If r = .77, what proportion of the change in Y is due to the change in X?

And:

If r = -.68, how much of the change in y is not related to the change in X?

I guess I was in orbit or something the day we covered this. Thanks for any help anybody can give me. Many, many thanks.

[OlderDan]

If you have a Java enabled browser, you can learn a lot about this topic from the simulation you will find here.

http://www.ruf.rice.edu/~lane/stat_sim/comp_r/index.html

It's worth your time. There are several other statistics demos at this site worth exploring.

For one thing, you will find

r^2 = explained/(explained + unexplained).