Decreasing the alpha level from α = .05 to α = .01 ____.
A)increases the probability of a Type I error
B)increases the size of the critical region
C)increases the probability that the sample will fall into the critical region
D)decreases the probability of a Type I error

Question

Decreasing the alpha level from α = .05 to α = .01 ____.​
A)​increases the probability of a Type I error
B)​increases the size of the critical region
C)​increases the probability that the sample will fall into the critical region
D)​decreases the probability of a Type I error

Quizplus · Accepted Answer

Decreasing the alpha level from .05 to .01 means we are decreasing the probability of rejecting the null hypothesis when it is actually true. This means that we are decreasing the probability of a Type I error.  Therefore, the correct answer is D.

Decreasing the Alpha Level from α =