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The distinction between one-tailed and two-tailed tests was popularized by Ronald Fisher in the influential (Fisher 1925), where he applied it especially to the normal distribution, which is a symmetric distribution with two equal tails. - read more

Purpose: Test if variances from two populations are equal An F-test (Snedecor and Cochran, 1983) is used to test if the variances of two populations are equal. - read more

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