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The lifetime of a certain type of battery is known to be normally distributed with standard deviation o=24 hours. A sample of 50 batteries had

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The lifetime of a certain type of battery is known to be normally distributed with standard deviation o=24 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours. It is desired to construct a 95% confidence interval for the mean lifetime for this type of battery. Part 1 of 6

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