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Does this diet help? A group of 78 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 23 pounds, with a sample standard deviation of 10 pounds. A second group of 35 people went on the diet but didn't exercise. After six months, their mean weight loss was 16 pounds, with a sample standard deviation of 8 pounds. Construct a 99% confidence interval for the mean difference in weight losses. Let u, denote the mean weight loss of the group with daily exercise. Use the TI-84 Plus calculator and round the answers to the nearest integer. A 99% confidence interval for the mean difference in weight loss, in pounds, is