Statement of a problem № m1094


The National Weight Control Registry tries to mine secrets of success from people who have lost at least 30 pounds and kept it off for at least a year. It reports that out of 2,700 registrants, 459 were on low-carbohydrate diets (less than 90 grams a day). a. Develop a 95% confidence interval for this fraction. b. Is it possible that the population percentage is 18%? c. How large a sample is needed to estimate the proportion within 0.5%?

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