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10. A random sample of 65 light bulbs had a mean life of 592 hours. Suppose that the standard deviation of all light bulbs of

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10. A random sample of 65 light bulbs had a mean life of 592 hours. Suppose that the standard deviation of all light bulbs of this type is A. Identify the point estimate and the margins of error of a 99% confidence interval for the mean life, all light bulbs of this type B. Construct a 99% confidence interval for the population mean

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