Suppose that textbook weights are normally distributed.  You measure 26 textbooks' weights, and find they have a mean weight of 69 ounces. Assume the population standard deviation is 10 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places.

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Suppose that textbook weights are normally distributed.  You measure 26 textbooks' weights, and find they have a mean weight of 69 ounces. Assume the population standard deviation is 10 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places.

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