The probability of making a type I error is typically equal to ______.
A) .01
B) .05
C) .95
D) .99

Question

Quizplus · Accepted Answer

A type I error occurs when we reject a true null hypothesis. We set the probability of making a type I error (also known as the level of significance) before conducting the hypothesis test, and the standard level used in many fields is .05, or 5%. Therefore, the best choice is B, with a level of significance of .05.

The Probability of Making a Type I Error Is Typically