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Mathematics, 21.06.2021 16:30 aromesburg
The lifetime of a certain brand of battery is known to have a standard deviation of 9 hours. Suppose that a random sample of 90 such batteries has a mean lifetime of 38.9 hours. Based 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 9 hours. Suppose...
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