A sample of eight students were selected to test the effectiveness of a course designed to improve typing skills. Their typing scores before and after the course are recorded below. Test the course for effectiveness at α = 0.01. Student 1 2 3 4 5 6 7 8 Mean Std. dev. Before 45 38 60 35 70 48 39 49 48 11.88 After 56 42 62 39 75 50 42 56 52.75 12.13 Difference -11 -4 -2 -4 -5 -2 -3 -7 -4.75 3.012 What is the test statistic value?