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E. How large a sample is needed if we want to be 95% co- mean life span of the batteries is not off by more than 0.5 ✓ [Select 1

E. How large a sample is needed if we want to be 95% co- mean life span of the batteries is not off by more than 0.5 ✓ [Select 1

MATLAB: An Introduction with Applications
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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At a certain plant, batteries are produced with a life span that is normally distributed with a standard deviation of 2 months. The plant claims that on the average the batteries will lasts for 15 months. A consumer group want to test the claim with a random sample of 27 batteries that showed an average of 14.5 months.
Transcribed Image Text:At a certain plant, batteries are produced with a life span that is normally distributed with a standard deviation of 2 months. The plant claims that on the average the batteries will lasts for 15 months. A consumer group want to test the claim with a random sample of 27 batteries that showed an average of 14.5 months.
E. How large a sample is needed if we want to be 95% confident that our estimate of the true mean life span of the batteries is not off by more than 0.5 months? ✓ [Select] 62 68 47 44
Transcribed Image Text:E. How large a sample is needed if we want to be 95% confident that our estimate of the true mean life span of the batteries is not off by more than 0.5 months? ✓ [Select] 62 68 47 44
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