Card 4 / 10: Use the following information for questions 1-3: In a cohort study of breast cancer in older women, there are two groups, those who were exposed to a known carcinogen and those who were not.If we add additional people into the unexposed group while keeping all other factors the same, will the width of the confidence interval increase, decrease, or remain the same?
Answer:
The width of the confidence interval will decrease, since the denominator, sqrt (N), increases
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Epidemiology Sampling & Confidence Intervals
Author:
Dr.Janet ForresterProfessor
Tufts University School of Medicine
USA
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