In a paired samples t-test, the variability of the two groups are not independent.

Question

Quizplus · Accepted Answer

Paired samples t-tests are used when the two groups being compared are not independent, but rather are related or matched in some way (e.g. pre- and post-treatment measurements on the same individuals). As a result, there is a systematic correlation between the data points in each group, which must be taken into account in the analysis.

In a Paired Samples T-Test, the Variability of the Two