An African American sociology student wants to test the hypothesis that Affirmative Action has helped alleviate racial discrimination on college campuses in the United States. The student does not have access to funds to pay interviewers or to use most other methods of gathering data so the student decides to use existing statistics as his source of data.

citing one source explain how this student should analyze the statistics that he or she finds. What variables should be compared to each other to test the hypothesis?