The critical values z_a or z _{a \ 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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Critical values are the boundary values that separate the rejection region(s) from the non-rejection region in hypothesis testing. They are determined based on the level of significance and help in deciding whether to reject the null hypothesis.

The Critical Values Z a or Z a

The Critical Values Z_a or Z _a