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You measure 45 randomly selected textbooks' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 7 ounces.

You measure 45 randomly selected textbooks' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 7 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.

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