This years’ statistics class was small (only 15 students). This group averaged 74.5 on the final…

This years’ statistics class was small (only 15 students). This group averaged 74.5 on the final exam with a sample standard deviation of 3.2. Assuming that this group is a random sample of all students who have taken statistics and the scores in the final exam for all students are approximately normally distributed, which of the following is an approximate 96% confidence interval for the true population mean of all statistics students? a. 74.5 ± 7.245 b. 74.5 ± 7.197 c. 74.5 ± 1.871 d. 74.5 ± 1.858 e. 74.5 ± 1.772