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The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons.

a. What is the value of the population mean? What is the best estimate of the value?
b. describe why we need to use t distribution. What assumption do you need to make?
c. For a 90 percent confident interval, what is the value of t?
d. Develop the 90 percent confidence interval for population mean.
e. Would it be reasonable to conclude that the population mean is 63 gallons?

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