Is it harder to get into graduate programs in psychology or history?

Is it harder to get into graduate programs in psychology or history? We randomly selected five institutions from among all U.S. institutions with graduate programs. The first number for each is the minimum grade point average (GPA) for applicants to the psychology doctoral program, and the second is for applicants to the history doctoral program. These GPAs were posted on the Web site of the well-known college guide company Peterson's.

psychology doctoral program (PDP)

history doctoral program (HDP)

Wayne State University

3.0 (PDP)

2.75 (HDP)

University of Iowa

3.0 (PDP)

3.0 (HDP)

University of Nevada

3.0 (PDP)

2.75(HDP)

George Washington University

3.0 (PDP)

3.0 (HDP)

University of Wyoming

3.0 (PDP)

3.0 (HDP)

Question

B. Conduct all six steps of paired-samples t test.