A time study of a factory worker has revealed an aver-age observed time of 3.20 minutes, with a standard deviation of 1.28 minutes. These figures were based on a sample of 45 obser-vations. Is this sample adequate in size for the firm to be 99% confident that the standard time is within {5% of the true value?If not, what should be the proper number of observations?
A time study of a factory worker has revealed an aver-age observed time of 3.20 minutes, with a standard deviation of 1.28 minutes. These figures were based on a sample of 45 obser-vations. Is this sample adequate in size for the firm to be 99% confident that the standard time is within {5% of the true value?If not, what should be the proper number of observations?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A time study of a factory worker has revealed an aver-
age observed time of 3.20 minutes, with a standard deviation of
1.28 minutes. These figures were based on a sample of 45 obser-
vations. Is this sample adequate in size for the firm to be 99%
confident that the standard time is within {5% of the true value?
If not, what should be the proper number of observations?
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