fetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 60 such batteries has a mean he of 41.1 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 limit. your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) ower limit: pper limit: I

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 60 such batteries has a mean
lifetime of 41.1 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.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)
Lower limit:||
Upper limit:
Transcribed Image Text:The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 60 such batteries has a mean lifetime of 41.1 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. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit:|| Upper limit:
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