http://standards.nctm.org/document/eexamples/chap7/7.4/index.htm

This site will give will allow the students to move the various points on a regression equation. It has work problems included.

http://www.seeingstatistics.com/

This site has what products that are available for visualizing statistics.

http://www.mste.uiuc.edu/exner/java.f/leastsquares/

This site will allow you to enter points and grph them on a lineary regression

http://lib.stat.cmu.edu/DASL/allsubjects.html

http://it.stlawu.edu/~rlock/maa51/data.html