A manager is interested in estimating the mean time (in minutes) required to complete a job. His
Question:
A manager is interested in estimating the mean time (in minutes) required to complete a job. His assistant uses a sample of 100 observations to report the confidence interval as [14.355, 17.645]. The population standard deviation is known to be equal to 10 minutes.
a. Find the sample mean time used to compute the confidence interval.
b. Determine the confidence level used for the analysis.
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N 40 10 a x z 2 10 100 14355 x z 2 10 100 17645 There...View the full answer
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Sandhya Sharma
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Related Book For 
Essentials Of Business Statistics Communicating With Numbers
ISBN: 9780078020544
1st Edition
Authors: Sanjiv Jaggia, Alison Kelly
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