A group of student researchers believe that there is a relationship between attitudes toward social issues (1-10) and amount of political activity (0-15). The group surveyed students (N=102) at the union every day for an entire semester about their attitudes toward social issues (M=6.14, SD=1.07) and recorded the number of political events attended on campus (M=8.69, SD=2.51).

What are the tests assumptions?