An alpha level of 0.05 indicates that _________.
A) if H 0 is true, the probability of falsely rejecting it is limited to 0.05
B) 95% of the time, chance is operating
C) the probability of a Type II error is 0.05
D) the probability of a correct decision is 0.05

Question

Quizplus · Accepted Answer

An alpha level of 0.05 sets the level of significance at 5%, meaning that if the null hypothesis is true, there is a 5% chance of falsely rejecting it (also known as a Type I error). This is why option A is the correct answer. Option B is incorrect because an alpha level of 0.05 doesn't tell us anything about the percentage of times chance is operating. Option C is incorrect because the probability of a Type II error is not the same as the alpha level. Option D is incorrect because the alpha level is not directly related to the probability of a correct decision.

An Alpha Level of 0.05 Indicates That _________