If we are using a directional alternative hypothesis for a z-test with α = .01, what critical value(s) should be used for rejecting the null hypothesis?
A) -2.33 only or +2.33 only.
B) either ±2.33
C) -2.58 only or +2.58 only.
D) either ±2.58.

Question

Quizplus · Accepted Answer

For a directional (one-tailed) test with α = .01, the critical z-value is either -2.33 or +2.33, depending on the direction of the test.

If We Are Using a Directional Alternative Hypothesis for a Z-Test