The Wilcoxon rank sum test is a nonparametric test that measures the degree of association between two variables for which only rank-order data are available.

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The Wilcoxon rank sum test is used to compare two independent samples to assess whether their population mean ranks differ; it does not measure the degree of association between two variables. The Spearman's rank correlation coefficient is an example of a test that measures the degree of association using rank-order data.

The Wilcoxon Rank Sum Test Is a Nonparametric Test That