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You measure 20 textbooks' weights, and find they have a mean weight of 40 ounces. Assume the population is normally distributed with a standard deviation

You measure 20 textbooks' weights, and find they have a mean weight of 40 ounces. Assume the population is normally distributed with a standard deviation of 14.4 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.

Give your answers correct to at least two decimal places.

Lower Limit =

Upper Limit =

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