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Asked Mar 8, 2020
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An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. There are 50 children without bronchitis in the sample, and they have a mean PEF of 316 with a standard deviation of 71. Construct a 95% confidence interval for the mean PEF in children without chronic bronchitis.

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