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Topic: [ap-stat] Re: r^2
Replies: 1   Last Post: Sep 22, 2005 9:16 PM

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Al Coons

Posts: 679
Registered: 12/6/04
[ap-stat] Re: r^2
Posted: Sep 22, 2005 9:16 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply might the short PowerPoint presentation on our website
helpful. Keep hitting the spacebar and have your students describe
what appears. While this is a one point simplification and you can
argue it misses some of the fine points, it seems to help with the
understanding for most students.

You will find it at


Investigate-Explain/Downloadable PowerPoint Presentations/
Understanding r-squared.

Make sure you get the PowerPoint file, not the Word file with the
same title higher up on the page. You might find that exercise handy
also though.

Albert Coons
Buckingham Browne & Nichols School
Gerry's Landing Road
Cambridge, MA 02138
(617) 800-2264

AP Statistics Web Site:

On Sep 22, 2005, at 12:23 PM, Seitz, Brian M wrote:

> I am using the YMM textbook, and my students are having trouble
> understanding the interpretation of r^2. What is the best way to
> explain this to them? For example, if r^2 = .6, what determines the
> other .4 of the variation? Would it make sense to say that if r^2 for
> wife's height and husband's height is .6, then the other .4 of the
> variation is accounted for by other variables? Thanks, Brian Seitz
> Northview HS Duluth, GA

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