Hypothesis testing glossary

The University of Lancaster in England has developed an online glossary, for easy lookup of many of the terms used in this class. It is a good reference or check to make sure whether you know a definition.
 
Two population  Hypothesis testing
 

An alternative treatment of differences between population means.
 

Example slides comparing difference between population means and paired difference t-tests, and the power of pairing.

Web-based calculators

A list of all kinds of calculator links is provided by David Lane.

A t-distribution calculator I like gives and shows you the area under the t between any two points. It has slider bars for changing the boundaries and the degrees of freedom. It is pretty easy to use.

Hyperstat has calculators for all kinds of distributions.