Setup: Weight loss researchers at Charlie's Workout World are interested in the proportion of people in the population who lose more weight by exercise alone than by diet and exercise combined. The researchers randomly put people into the exercise group and the diet and exercise group. In a random sample of 683 from the exercise group, 29 lost more than 15 pounds in a year, whereas 23 out of 890 from the diet and exercise group lost more than 15 pounds in a year. The 90.4% confidence interval for pDiet