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You measure 20 textbooks' weights, and find they have a mean weight of 38 ounces. Assume the population standard deviation is 4.2 ounces. Based on

You measure 20 textbooks' weights, and find they have a mean weight of 38 ounces. Assume the population standard deviation is 4.2 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.

Give your answers as decimals, to two places _______< <_______________

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