MATLAB: An Introduction with Applications

6th Edition

ISBN: 9781119256830

Author: Amos Gilat

Publisher: John Wiley & Sons Inc

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Question

For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.

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 *first* try.

(a) If you have no preliminary estimate for

phone calls

(b) A report states that businesspeople can be reached by a single phone call approximately 15% of the time. Using this (national) estimate for

phone calls

*p*, how many business phone calls should you include in a random sample to be 80% sure that the point estimate p̂ will be within a distance of 0.03 from*p*? (Round your answer up to the nearest whole number.)phone calls

(b) A report states that businesspeople can be reached by a single phone call approximately 15% of the time. Using this (national) estimate for

*p*, answer part (a). (Round your answer up to the nearest whole number.)phone calls

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