The Graduate Record Exam (GRE) Verbal test is reported to have a mean score of about 150 and a standard deviation of about 8 (Educational Testing Service, XXXXXXXXXXThe GRE prep course you are...

The Graduate Record Exam (GRE) Verbal test is reported to have a mean score of about 150 and a standard deviation of about 8 (Educational Testing Service, 2016). The GRE prep course you are thinking of taking advertises that it can improve scores on this test. They report that the mean score for this year’s class of 100 students scored a mean of 160 on the test. Based on these values, is it worth it to take the class?