# How hard is it to reach a businessperson by phone? Let p be the proportion of calls

## Question:

(a) 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 will be within a distance of 0.03 from p?

(b) The Book of Odds by Shook and Shook (Signet) reports that businesspeople can be reached by a single phone call approximately 17% of the time. Using this (national) estimate for p, answer part (a).

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**Related Book For**

## Understanding Basic Statistics

**ISBN:** 9781111827021

6th Edition

**Authors:** Charles Henry Brase, Corrinne Pellillo Brase