Introduction to the t-score
The t-score in depth
Comparing the t-score to the z-score
Zscore vs Tscore Assignment
Matched Pairs Design
Matched Pairs Assignment
More on matched pair
Two sample independent t-test
Two independent means Assignment
More examples of two independent samples
Shoe Size activity notes
Shoe Size Activity
Error Type Introduction
ACT WS
Error Types and probability
Corn WS
Error Types in depth
Review

William S. Gosset developed the idea of the t-score when working in Guinness brewery in 1899. Gosset had a problem when using the z-score because he rarely knew what value his population standard deviation was. He also noticed that the samples he was collecting at the brewery were relatively small and this developed problems when using his statistics. The new t-test he developed helped him to establish the best barley variety for the different types of beer being brewed. Gosset's statistical work helped him to become the head brewer, definitely a bit more exciting than professor of statistics.

We still use this distribution today to help us make inferences about a population mean.