The set of all standard scores more extreme than the critical values is called a rejection region and constitutes an unexpected result.

Question

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This statement is true. The rejection region includes all standard scores that have a low probability of occurring under the null hypothesis, and therefore constitute evidence against the null hypothesis. If the observed test statistic falls within this rejection region, it suggests that the null hypothesis should be rejected in favor of the alternative hypothesis, and that the result is unexpected.

The Set of All Standard Scores More Extreme Than the Critical