Rejection regions are determined with reference to an alpha level.

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Rejection regions are determined with reference to an alpha level, which is typically set at 0.05 or 0.01. The alpha level represents the probability of making a Type I error, or rejecting a true null hypothesis. The rejection region is the range of values for the test statistic that would lead to the rejection of the null hypothesis, based on the chosen alpha level and the degrees of freedom for the test.

Rejection Regions Are Determined with Reference to an Alpha Level