Are low-fat diets or low-carb diets more effective for weight loss? A sample of 58 subjects went on a low-carbohydrate diet for six months. At the end of that time, the sample mean weight loss was 2.9 kilograms with a sample standard deviation of 7.83 kilograms. A second sample of 69 subjects went on a low-fat diet. Their sample mean weight loss was 2.4 kilograms with a standard deviation of 4.53 kilograms. Can you conclude that the mean weight loss differs between the two diets? Use the level.