The Wilcoxon signed-rank test is a nonparametric test that 1) uses the directions of differences observed in a matched pairs sample to determine whether the relative frequency distributions of two statistical populations are identical to or different from one another and 2) determines whether a sample comes from a population with a specified median.

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The Wilcoxon signed-rank test is a nonparametric test used to compare two related samples, matched samples, or repeated measurements on a single sample to assess whether their population mean ranks differ; it does not directly test for differences in relative frequency distributions or determine if a sample comes from a population with a specified median.

The Wilcoxon Signed-Rank Test Is a Nonparametric Test That 1)