SOLUTION: You measure 49 textbooks' weights, and find they have a mean weight of 65 ounces. Assume the population standard deviation is 8.9 ounces. Based on this, construct a 99% confidence

Question 1181559: You measure 49 textbooks' weights, and find they have a mean weight of 65 ounces. Assume the population standard deviation is 8.9 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.
Give your answers as decimals, to two places
_____< μ < _____
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
99% half-interval is z(0.995)*sigma/sqrt(n)
=2.576*8.9/sqrt(49)=3.275 or 3.28 oz
interval is (61.72, 68.28) oz
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