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Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the...

Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. 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. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without? Run the appropriate test at α=0.05.

Group

Number of Children

Mean PEF

Std Dev PEF

Chronic Bronchitis

42

265

65

No Chronic Bronchitis

40

319

70

a) Hypotheses

b) Calculate S2p

c) Compute Test statistic

d) P-value

e) Conclusion

f) Calculate a 95% confidence interval for mean difference

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