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You measure 30 textbooks' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 4 ounces. Based on

You measure 30 textbooks' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 4 ounces.

Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give the answers as decimals, to two places

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