The critical value for a one-tailed z-test,given a significance level of 0.05,would be ________.
A) either -1.96 or 1.96
B) either -4.0 or 4.0
C) either -1.25 or 1.25
D) either -1.71 or 1.71
E) either -1.645 or 1.645

Question

Quizplus · Accepted Answer

The critical value for a one-tailed z-test with a significance level of 0.05 is either -1.645 or 1.645. This value corresponds to the area in the tail of the standard normal distribution that has a probability of 0.05. Other choices (-1.96, 1.96, -4.0, 4.0, -1.25, and 1.25) are either incorrect or do not correspond to a significance level of 0.05 for a one-tailed test.

The Critical Value for a One-Tailed Z-Test,given a Significance Level