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In statistics, the Mann–Whitney U test , Wilcoxon rank-sum test, or Wilcoxon–Mann–Whitney test] is a nonparametric test of the null hypothesis that, for randomly selected values X and Y from two populations, the probability of X being greater than Y is equal to the probability of Y being greater than X.
Nonparametric tests used on two dependent samples are the Sign test and the Wilcoxon signed-rank test.
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