The critical values z _$\alpha$ or z _$\alpha$ _{/ 2} are the boundary values for: A) the rejection region(s). B) the level of significance. C) Type I error. D) Type II error.

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The critical values are the boundary values that determine the rejection region(s) for a hypothesis test. They are the values of the test statistic beyond which we reject the null hypothesis. The other options (B, C, and D) are related to the concept of significance level and errors in hypothesis testing, but they are not directly related to the critical values.

The Critical Values Z α\alphaα or Z α\alphaα

The Critical Values Z _$\alpha$ or Z _$\alpha$