4. Do students who are members of fraternities or sororities at Methods University (MU) have GPAs different from the entire student body at MU?

a. State the appropriate null hypothesis and research hypothesis for the above question

b. Is the stated hypothesis one-tailed or two-tailed? Justify your response

5. A random sample of 123 "Greeks" has been selected from the student body of Methods university. A t-test of the difference between the mean GPA for the sample and the entire student body was -2.58 [t (critical) = 1.96].

a. Is the difference statistically significant? Make sure that you interpret the results in terms of the original research question.