Brian...you 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.
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.
Al ------------------------- Albert Coons firstname.lastname@example.org Buckingham Browne & Nichols School Gerry's Landing Road Cambridge, MA 02138 (617) 800-2264
AP Statistics Web Site: www.bbn-school.org/us/math/ap_stats
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