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StatisticsQ&A LibraryThe lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 150 such batteries has a mean lifetime of 34 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and upper limit.Start your trial now! First week only $4.99!*arrow_forward*

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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 150 such batteries has a mean lifetime of 34 hours. Based on this sample, find a

90% 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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