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You measure 28 textbooks' weights, and find they have a mean weight of 80 ounces. Assume the population standard deviation is 7 ounces. Based on

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You measure 28 textbooks' weights, and find they have a mean weight of 80 ounces. Assume the population standard deviation is 7 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places

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