With alpha set at .05, the Critical Region for a two-tailed test would begin at±1.96. In a one-tailed test at the same alpha level the Critical Region would begin at________.
A) ± 1.96.
B) ± 2.58.
C) ± 2.30.
D) ± 1.65.

Question

Quizplus · Accepted Answer

In a one-tailed test, the critical region is located entirely in one tail of the distribution. To find the critical value for a one-tailed test at alpha level .05, we need to divide alpha by 2 (since we are only looking at one tail) and then use a table or calculator to find the corresponding z-score. This calculation gives us a critical value of approximately 1.65. Therefore, the critical region for a one-tailed test at alpha level .05 would begin at ±1.65.

With Alpha Set at