Does this diet help? A group of 74 people enrolled in a weight-loss program that involved adhering to a special diet and to a daily exercise program. After six months, their mean weight loss was 25 pounds, with a sample standard deviation of 8 pounds. A second group of 48 people went on the diet but didn't exercise. After six months, their mean weight loss was 14 pounds, with a sample standard deviation of 6 pounds. Construct an 80% confidence interval for the mean difference in weight losses. Let u, denote the mean weight loss of the group with daily exercise. Use tables to find the critical value and round the answers to the nearest integer. A 80% confidence interval for the difference in the mean difference in weight loss, in pounds, is
