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How hard is it to reach a buisnessperson by phone? Let p be the proportion of...

How hard is it to reach a buisnessperson by phone? Let p be the proportion of calls to buisnesspeople for which the caller reaches the person being called on the first try.
(a) If you have no preliminary estimate for p, how mant buisness phone calls should you include in a random sample to be 80% sure that the point estimate p^ will be within a distance from 0.05 from p?

(b) A report states that buisnesspeople can be reached by a single phone call approximately 13% of the time. Using this (national) estimate for p, answer part (a).
Math   Statistics-And-Probability   
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