![]() ![]() Rejection Region for Lower-Tailed Z Test (H 1: μ 1.960. The decision rule is: Reject H 0 if Z > 1.645. Rejection Region for Upper-Tailed Z Test (H 1: μ > μ 0 ) with α=0.05 The decision rules are written below each figure. Notice that the rejection regions are in the upper, lower and both tails of the curves, respectively. ![]() The following figures illustrate the rejection regions defined by the decision rule for upper-, lower- and two-tailed Z tests with α=0.05. ![]() For example, in an upper tailed Z test, if α =0.05 then the critical value is Z=1.645. The level of significance which is selected in Step 1 (e.g., α =0.05) dictates the critical value.
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