MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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100%

The lifetime of a certain brand of battery is known to have a standard deviation of 

19.8

 hours. Suppose that a random sample of 

80

 such batteries has a mean lifetime of 

35.8

 hours. Based on this sample, find a 

95%

 confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and upper limit.

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