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Use the confidence level and sample data to find a confidence interval for estimating the population u. Round your answer to the same number of

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Use the confidence level and sample data to find a confidence interval for estimating the population u. Round your answer to the same number of decimal places as the sample mean. A random sample of 81 light bulbs had a mean life of x - 407 hours with a standard deviation of o = 31 hours. Construct a 90% confidence interval for the mean life, u, of all light bulbs of this type. 398 hr

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