
Papers
 Introduction to the tTest (University of Leicester)
Describes the conditions that must be met in order to use of the test.
"Ztest and ttest are basically the same, they compare between two means to suggest whether both samples come from the same population. There are however variations on the theme for the ttest. If you have a sample and wish to compare it with a known mean (e.g. national average) the single sample ttest is available. If both of your samples are not independent of each other and have some factor in common, i.e. geographical location or before/after treatment, the paired sample ttest can be applied. There are also two variations on the two sample ttest, the first uses samples that do not have equal variances and the second uses samples whose variances are equal."
 Student's tTest for Independent Samples (MacFarland)
Describes how and why to use a ttest.
 tTest Problem (Polamar.edu)
Provides an example of how to calculate a ttest.
 tTest for Dependent and Independent Samples (Statsoft.com)
Describes the concepts and methods.
 tTest for Independent Samples (Statsoft.com)
Describes the concepts and methods.

