In a Mann-Whitney U test, the test statistic will be equal to the sum of the ranks from sample one, or sample two, whichever is larger.

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The Mann-Whitney U test statistic is calculated separately for each sample and is not simply the sum of the ranks of one of the samples. It involves calculating the sum of ranks for each sample and then using these sums to calculate two U values, one for each sample. The smaller of these two U values is often used as the test statistic.

In a Mann-Whitney U Test, the Test Statistic Will Be