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Can you explain A random sample of medical files is used to estimate the proportion p of all people who have blood type B. a)

Can you explain

A random sample of medical files is used to estimate the proportion p of all people who have blood type B. a) If you have no preliminary estimate for p , how many medical files should you include in a random sample in order to be 85% sure that the point estimate p is within a distance of 0.05 from p ; that is, the (percent) error is 5%?

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