Low-fat or low-carb? Are low-fat diets or low-carb diets more effective for weight loss? A sample of 80 subjects went on a low-carbohydrate diet for six OO months. At the end of that time, the sample mean weight loss was 4.7 kilograms with a sample standard deviation of 7.6 kilograms. A second sample of 76 subjects went on a low-fat diet. Their sample mean weight loss was 2.5 kilograms with a standard deviation of 6 kilograms. Part: 0 / 2 Part 1 of 2 (a) Construct a 98% confidence interval for the difference in mean weight loss between the low-carb and low-fat diets. Let H, denote the mean weight loss for low-carb diet. Use the TI-84 calculator and round the answers to one decimal place. A 98% confidence interval for the difference in mean weight loss between the low-carb and low-fat diets is X