Atest 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. construct a 95% confidence interval for the mean difference between the before and after scores. start 2 by 11 table 1st row 1st column before 2nd column 74 3rd column 83 4st column 75 5st column 88 6st column 84 7st column 63 8st column 93 9st column 84 10st column 91 11st column 77 2nd row 1st column after 2nd column 73 3rd column 77 4st column 70 5st column 77 6st column 74 7st column 67 8st column 95 9st column 83 10st column 84 11st column 75 endtable before 74 83 75 88 84 63 93 84 91 77 after 73 77 70 77 74 67 95 83 84 75