1. The Effect of Outliers on Regression

http://www.stat.sc.edu/~west/javahtml/Regression.html

Use this applet and add extreme scores. Then evaluate what happens to the regression line when the extreme scores are removed.

2. Sampling Distributions Tutorial

http://wise.cgu.edu/sdmmod/index.asp

This applet demonstrates the properties of sampling distributions. Designed by WISE (The Web Interface for Statistics Education), it uses exercises to guides students through the tutorial.