A researcher constructs a 95% confidence interval for the proportion p of women, between 40 and 45 years of age, who have breast cancer. Suppose the investigator wants the margin of error to be 0.01. How many women must be involved in the study to ensure that the estimate is precise?
Added by Mario M.
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96), p is the estimated proportion, and n is the sample size. We want the margin of error to be 0.01, so we can plug in the values we know and solve for n: 0.01 = 1.96*sqrt((p*(1-p))/n) Show more…
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