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In statistics, a double tail (or two-tailed) test is used to determine if a sample mean significantly differs from a population mean in either direction, whether higher or lower. It assesses the probability of observing extreme values in both tails of the distribution. This type of test is useful when the researcher does not have a specific direction of interest for the effect being studied. In hypothesis testing, a two-tailed test typically requires a higher level of significance to reject the null hypothesis compared to a one-tailed test.

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∙ 11mo ago

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