The Wilcoxon signed- rank test is a nonparametric procedure that can be used to compare two independent samples.

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The Wilcoxon signed-rank test is used to compare two related samples or repeated measurements on a single sample to assess whether their population mean ranks differ. For comparing two independent samples, the Wilcoxon rank-sum test (also known as the Mann-Whitney U test) is used instead.

The Wilcoxon Signed- Rank Test Is a Nonparametric Procedure That