The critical region for a hypothesis test consists of sample outcomes that are very unlikely to occur if the null hypothesis is true.

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This statement is true. The critical region is chosen such that the probability of observing a sample outcome within that region is very low, typically 5% or lower. If the null hypothesis is true and the sample outcome falls within the critical region, we reject the null hypothesis and conclude that the alternative hypothesis is more likely to be true.

The Critical Region for a Hypothesis Test Consists of Sample