When calculating your U-values to obtain your U-statistic, the two U values will sum up to the product of the two sample sizes.

Question

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The sum of the two U values in a Mann-Whitney U test equals the product of the sizes of the two samples because the U statistic represents the number of pairwise comparisons between the two groups, and every possible pairing must be accounted for.

When Calculating Your U-Values to Obtain Your U-Statistic, the Two