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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.
2 Testing has changed in many ways since it first appeared with the beginning of public education led by Horace Mann. Standardized testing is the most commonly used and well known method of testing used in the United States as well as numerous other countries in the world.