The data below come from a study designed to examine the following research hypothesis: Students who attend every class in PSYC2113 will show significantly better final grades in the course than students who miss one or more classes. Answer the following questions using these data (n = 40 in each group)

2.1.2. Compute a two-samples t-test to test the null hypothesis that the two groups are not significantly different from each other. 2.1.1. Students get credit towrd program requirements for a course if they get a final grade of at least 55% (a grade of C). Use a one-sample t-test to test the null hypothesis the mean for the group that missed class is not significantly different from the passing grade (55%).