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Gastric bypass surgery. How effective is gastric bypass surgery in maintaining weight loss in extremely obese...

Gastric bypass surgery. How effective is gastric bypass surgery in maintaining weight loss in extremely obese people? A Utah-based study conducted between 2000 and 2011 found that 76% of 418 subjects who had received gastric bypass surgery maintained at least a 20% weight loss six years after surgery.22

(a)Are the conditions for the use of the large-sample confidence interval met?Explain.

(b)Give a 90% confidence interval for the proportion of those receiving gastric bypass surgery that maintained at least a 20% weight loss six years after surgery.

(c)Interpret your interval in the context of the problem.

Math   Statistics-And-Probability   
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(c) We are 90% confident that the proportion of those receiving gastric bypass surgery that maintained at least a 20% weight loss six years after surgery lies between 0.7256 and 0.7944.

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