This site has a series of Java animations to illustrate basic statistical concepts related to measuring relationships. The illustrations relate to measures that seek to describe if a relationship exists between two variables.
Visualizing Correlations: have students see if they can predict the actual correlation.
Restriction of Range: Change the correlation to different values and see if the effects of restriction of range are the same or different for weak vs. strong correlations.
correlation; restriction of range
Author: John H. Krantz