What is the effect of decreasing the alpha level (for example,from α = .05 to α = .01)?
A)It decreases the probability of a Type I error.
B)It decreases the size of the critical region.
C)It decreases the probability that the sample will fall into the critical region.
D)All of the other options are results of decreasing alpha.

Question

Quizplus · Accepted Answer

Decreasing the alpha level reduces the probability of making a Type I error (rejecting a true null hypothesis), which in turn decreases the size of the critical region (the range of values for which the null hypothesis is rejected). Consequently, this also reduces the likelihood that a given sample will fall into this critical region, making all the options correct outcomes of lowering the alpha level.

What Is the Effect of Decreasing the Alpha Level (For