The critical region is the most extreme portion of a distribution of statistical values for the null hypothesis, determined by the alpha level, typically of ______.
A) 5%
B) 10%
C) 15%
D) 20%

Question

Quizplus · Accepted Answer

The most commonly used alpha level is 0.05, which corresponds to a critical region in the tails of the distribution that contains the 5% of the most extreme values. Therefore, A) 5% is the best choice.

The Critical Region Is the Most Extreme Portion of a Distribution