When a researcher _____ the probability of making a Type I error, he or she _____ the probability of making a Type II error.
A)increases; increases
B)decreases; increases
C)decreases; decreases
D)decreases; does not affect

Question

Quizplus · Accepted Answer

When a researcher decreases the probability of making a Type I error (by setting a more stringent level of significance), it will increase the probability of making a Type II error because the researcher is less likely to reject the null hypothesis even when it is false. This trade-off between Type I and Type II errors is known as the power of the test.

When a Researcher _____ the Probability of Making a Type