Click on the following links. Please note these will open in a new window.

Video:
Introduction to t Test
Description: This video clip gives an overview of the t Test in a nontechnical way.

Differences Between z Test and t Test
Description: This video clip explains when to use z test and when to use t test and walks through an example.

Web:
Guinness (beer) and t Test
Description: This site discusses about the birth of t test, and about William Gosset who is the father of t test.

The Normal Distribution and t Distribution
Description: This applet allows you to see how the t distribution is related to the normal distribution. As the students increase the degrees of freedom, the t distribution starts to look like a normal distribution.