Question: Problem 2: The data below summarize the results ofa study designed to comparethemean PEF in children with andwithout chronic bronchitis.The data on children without chronic

Problem 2:The data below summarize the results ofa study designed to comparethemean PEF in children with andwithout 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 amargin of error of10 units or less. How many more children without chronic bronchitisneed to be surveyed?

Group Number of Children Mean PEF Std Dev PEF

Chronic Bronchitis 25 281 68

No Chronic Bronchitis 25 319 74

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