A test on world history was given to a group of individuals before and after a film on the history of the world was presented. The results are given below. Determine if the film significantly increased the test scores. (For the following matched samples, let d = After – Before.) Individual After Before 1 92 86 2 86 88 3 89 84 4 90 90 5 93 85 6 88 90 7 97 91 ? a. Give the hypotheses for this problem. b. Compute the test statistic. c. At 95% confidence, test the hypotheses.