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QUESTION
A doctor plans to know how many patients prefer injection to tablets. Given that z(/2)=2.
A doctor plans to know how many patients prefer injection to tablets. Given that z(α/2)=2.575, what size sample should be used to estimate in order to be within 5% with 99% confidence interval if we do not use a prior estimate? What if we use a prior estimate of 0.25 from last year?
