Taking an SAT preparatory course is believed to improve test scores. To investigate the effects of taking a preparatory course, scores were recorded for 5 students before and after they took the preparatory course. Does the data below support the claim that a preparatory course increases test scores? Use a significance level of = 0.02 ???? = 0 . 0 2 to test the claim. Student Before After 1 1200 1260 2 1100 1060 3 1050 950 4 1000 1000 5 920 1050 Denote by d ???? ???? the mean of the differences of the test scores for all students, where d = ???? = "Before - After". 1) What is/are the critical value(s)? Keep 4 decimal places. 2) What is your statistical decision? 1) 2.9985 2) Reject Ho 1) -1.5332 2) Do not reject Ho 1) -2.1318 2) Reject Ho 1) -2.9985 2) Do not reject Ho 1) -1.5332 2) reject Ho