The terms level of significance, alpha level, and critical region each refer to different things; they do not refer to the same thing.

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These terms are related and often used interchangeably in statistics. The level of significance (alpha level) is the threshold for rejecting the null hypothesis, and the critical region is the set of values for which the null hypothesis is rejected if the test statistic falls within this region, determined by the alpha level.

The Terms Level of Significance, Alpha Level, and Critical Region