The Wilcoxon rank- sum test is a nonparametric procedure that determines whether two populations have the same probability distribution based on evidence from two independent samples.

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The Wilcoxon rank-sum test, also known as the Mann-Whitney U test, is indeed a nonparametric statistical test used to compare two independent samples to assess whether their underlying population distributions differ significantly. It does not assume the data to be normally distributed and is used as an alternative to the t-test when the data do not meet the t-test assumptions.

The Wilcoxon Rank- Sum Test Is a Nonparametric Procedure That