# Probability : Calculate and Interpret a Confidence Interval

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20. The Associated Press (October 9, 2002) reported that in a survey of 4722 American youngsters aged 6 to 19, 15% were seriously overweight (a body mass index of at least 30; this index is a measure of weight relative to height). Calculate and interpret a confidence interval using a 99% confidence level for the proportion of all American youngsters who are seriously overweight.

See the attached file.

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#### Solution Summary

A confidence interval is calculated and interpreted in the solution.

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