Question: ACE-GMAT claims that its GMAT preparatory course improves students’ GMAT scores by at least 60 points on average. A consumer protection agency collected information on the GMAT scores of 18 randomly selected students who had completed the ACE-GMAT preparatory course. Their GMAT scores before and after the preparatory course are given below. Test the appropriate hypothesis at the 10% level of significance, assuming that the distribution of the GMAT score differences before and after taking the preparatory course is approximately normal. Make sure that all five steps of the hypothesis testing process are clearly identified in the appropriate order.