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You measure 31 textbooks' weights, and find they have a mean weight of 52 ounces. Assume...

You measure 31 textbooks' weights, and find they have a mean weight of 52 ounces. Assume the population standard deviation is 3.5 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places [,]

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