A researcher predicts that students who attend study groups will get higher grades than students who don't attend study groups. She decides to test this prediction by creating a research experiment. She has one class of 30 students come each week to a study group and at the end of the semester she calculates their average grades. She has a separate class of 30 students who do not do weekly study groups and at the end of the semester she calculates their average grades. Answer the following questions related to this example If, after gathering the data and running a t test, you rejected the null at p=.05 level, what is the probability you made a Type I error?

1. 95%
2. 1%
3. 5%
4. 10%

When you "fail to reject null there is a chance you made a Type II error.

True or False?