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The Mann-Whitney U-test is used to test whether two independent samples of observations are drawn from the same or identical distributions. An advantage with this test is that the two samples under consideration do not necessarily need to have the same number of observations or instances.
Paired t-test. This tutorial will walk you through the use of the paired t-test. The paired t-test should be used when the data are in pairs. One of the most common uses of this test is a before- and after- (pre and post) analysis. For example, we might be interested in how much a certain group grows after fertilizer is added to randomly selected plots.