A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 90% confident that the sample mean is correct to within ±$60 of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $439. a. How large a sample is necessary? b. If management wants to be correct to within ±$30, how many employees need to be selected?
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 90% confident that the sample mean is correct to within ±$60 of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $439. a. How large a sample is necessary? b. If management wants to be correct to within ±$30, how many employees need to be selected?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 90% confident that the sample mean is correct to within ±$60
of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $439.
of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately $439.
a. How large a sample is necessary?
b. If management wants to be correct to within ±$30, how many employees need to be selected?
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