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You measure 32 textbooks' weights, and find they have a mean weight of 35 ounces. Assume...

You measure 32 textbooks' weights, and find they have a mean weight of 35 ounces. Assume the population standard deviation is 12.1 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Use z = 2 (rather than 1.96) for your calculations. Give your answers as decimals, to two places (,)

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