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Suppose you are the quality control manager of a battery company. You have selected a sample of 100 batteries. You found the mean lifetime of

  1. Suppose you are the quality control manager of a battery company. You have selected a sample of 100 batteries. You found the mean lifetime of the 100 batteries is 58 hours. Based on historical data, he knows that the standard deviation of the lifetime of all the batteries in the company is 10 hours. Construct a 95% confidence interval for mean lifetime of all the batteries in the company.

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