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[Solution Library] A pollster wants to estimate the difference between the proportion of men and women who favor a particular national candidate using a 90%

Question: A pollster wants to estimate the difference between the proportion of men and women who favor a particular national candidate using a 90% confidence interval of width 0.04. Suppose the pollster has no prior information about the proportions. If equal number of men and women are to be polled, how large should the sample size be?

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