Children without chronic bronchitis need to be surveyed

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Reference no: EM132351167

The data below summarize the results of a study designed to compare the mean PEF in children with and without chronic bronchitis. The data on children without chronic bronchitis are surprising to the investigators, so they decide to study this more in-depth. Specifically, they would like to estimate the mean PEF in children without chronic bronchitis with a margin of error of 10 units or less. How many more children without chronic bronchitis need to be surveyed?

Group Number of Children Mean PEF Std Dev PEF

Chronic Bronchitis 25 281 68

No Chronic Bronchitis 25 319 74

Reference no: EM132351167

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