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 other source about bias in research, explain how this student could have bias in his study. That is, what would be some of the possible sources of his bias when using existing statistics about Affirmative Action?