In hypothesis testing, the rejection region is an area and a proportion and also a probability.

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The rejection region is an area of the distribution where, if the test statistic falls within that region, the null hypothesis is rejected. This region is determined by a critical value or a range of values computed based on the chosen significance level and the degrees of freedom of the test. This corresponds to a proportion of the distribution that falls within the rejection region, but it is not typically referred to as a probability.

In Hypothesis Testing, the Rejection Region Is an Area and a Proportion