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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.
Please try again later. When choosing which t test formula to use for an unpaired (independent) t test, you need to know whether the variances of the samples are equal or unequal. The F test is used to test equality of variance. here you will learn in a few easy steps how to manually calculate the F statistics and use F-Distribution tables to test for equality. You will also use Excel's Data Analysis to easily determine the same result.