26. Explain the difference between Type I and Type II Errors for hypothesis testing. Give an example of both types of errors. In your opinion which type of error is more important? Why?

27. In a study using two or more groups, what experimental design factors determine whether or not the groups (samples) are dependent (i.e., the groups are related or correlated).

29. Explain the difference between one-tailed (directional) and two-tailed (nondirectional) hypothesis tests.

30. For a t test with a = .05 and df = 8, what are the critical values for a one-tailed test and a two-tailed test?