How hard is it to reach a businessperson by phone? Let p be the proportion of calls to businesspeople for which the caller reaches the person being called on the fist try. If you have no preliminary estimate for p, how many business phone calls should you include in a random sample to be 80% sure that the point estimate p will be within a distance of 0.04 from p? A report states that business people can be reached by a single phone call approximately 22% of the time. Using the national estimate for p
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