Mathematics, 07.06.2021 06:50 fernandoramirez086

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 90 such batteries has a mean lifetime of 46 2 hours Sased on this sample, find a 90° confidence interval for the true mean lifetime of all batteries of this brand.

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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 90 such batteries has a mean lifetime of 46 2 hours Sased on this sample, find a 90° confidence interval for the true mean lifetime of all batteries of this brand.​

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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 90 such batteries has a mean lifetime of 46 2 hours Sased on this sample, find a 90° confidence interval for the true mean lifetime of all batteries of this brand.