Mann-Whitney U Test Definition
noun
A nonparametric test of the null hypothesis that the probability that a randomly selected value from one population is less than a randomly selected value from a second population is equal to the probability of being greater. It can be used to investigate whether two independent samples were selected from populations having the same distribution .
Wiktionary
Origin of Mann-Whitney U Test
Developed by Henry B. Mann and Donald R. Whitney, who described it in a 1947 paper.
From Wiktionary
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