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The Mann-Whitney U-test is used to test whether two independent samples of observations are drawn from the same or identical distributions. An advantage with this test is that the two samples under consideration do not necessarily need to have the same number of observations or instances.
It became a way to persecute large numbers of unmarried couples participating in premarital or extramarital activities, especially when it involved crossing state lines such as in the cases for Chuck Berry and Jack Johnson. The Mann Act also became a form of blackmail, by wives who were suspicious of cheating husbands or other women.