Web Resources

This article describes the rules of probability, example problems with answers and explanations, and probability calculator.
 
This website illustrates the normal curve and discusses the meaning behind it. Also discusses scores (T-scores, z-scores, scaled scores) and percentiles.
 
This article describes the normal curve and how to find the area under the normal curve. 
 
This article and calculator describe how to convert a z score to a raw score.
 
This article and calculator describe how to convert a raw score to a z score.