September 2016
Intermediate to advanced
262 pages
5h 32m
English
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Chapter 7: Two-Sample Tests
Unpaired t Test (t Test for Independent Groups)
Nonparametric Two-sample Tests
Introduction
There are two classes of two-sample tests that you will see in this chapter. One is an unpaired t test (also called a t test for independent groups) that is used to compare means between two groups. The other type of two-sample t test is a paired t test. A common situation where a paired t test is performed is when each subject is measured twice, typically before and after some treatment. It can also be used when experimental units are paired on certain characteristics such as gender and age before the experiment and the variable of interest is the difference between values in ...
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