CHAPTER 4

Comparing Two Unrelated Samples

The Mann–Whitney U Test

Mann–Whitney U Test

The Mann–Whitney U test is a nonparametric procedure that is used to determine whether the populations corresponding to two random samples that are not related are similar. The samples are drawn independently from each other and at random. Using their sample medians, the test can also be used to examine the possibility that the two random samples are from the same population. The test indicates whether the medians of the two samples are different, which is equivalent to determining whether the distributions of the rank-orders of the observations are different. This test is comparable to the t test for parametric statistics, which is used to compare two means ...

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