Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: [ap-stat] r^2
Replies: 6   Last Post: Oct 23, 2005 9:44 PM

 Messages: [ Previous | Next ]
 Tara Nee Posts: 40 Registered: 9/20/05
[ap-stat] r^2
Posted: Oct 20, 2005 7:28 AM

Hello all,

Whenever we talk about r^2 and it being the fraction of the variation in
the values of y that is explained by least-squares regression of y on x,
my students eyes glaze over and they look at me like I am crazy. I would
like a simpler way to explain, but am not sure if I am right.

For example if r^2=.3562, then 35.62% of the variation can be explained by
the linear relationship... does that mean that 35.62% of the data points
are close to the LSRL and that 64.38% of the points are more spread out?

Is there a better way of expaining this to students?

Thanks,
Tara

====
Course related websites:
AP Central: http://apcentral.collegeboard.com/stats
FAQ: http://www.mrderksen.com/faq.htm
Archives: http://mathforum.org/kb/forum.jspa?forumID=67
ap-stat is an Electronic Discussion Group (EDG) of The College Board, 45 Columbus Avenue, New York, NY 10023-6992

http://lyris.collegeboard.com/cgi-bin/lyris.pl?enter=ap-stat

Send questions about the list to owner-ap-stat@lyris.collegeboard.com

Date Subject Author
10/20/05 Tara Nee
10/20/05 John Mordigal
10/20/05 Teague, Dan
10/21/05 Mark Bailey
10/21/05 bullard@ncssm.edu
10/22/05 J Lieb
10/23/05 randy ewart