This detailed slideshow outlines the purpose, use, and definitions of terms related to correlational design. 

 

Definition of point biserial correlation.

 

Definition and interpretation of phi coefficient.

 

This simulation illustrates the effect of restricting the range of scores on the correlation between variables.

 

This website gives a description of linear regression. Also includes definitions of terms and short video.

 

This simulation allows users to explore fitting data with linear functions.

 

This website provides an in-depth description of the basics of regression.