Assume that two dependent samples have been randomly selected from normally distributed populations. 4) A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course. The results are given below. At the 0.05 significance level, claim that the mean score is not affected by the course. Before 74 83 75 88 84 63 93 84 91 77 After 73 77 70 77 74 67 95 83 84 75