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The u.s. dairy industry wants to estimate the mean yearly milk

The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 29 people reveals the mean yearly consumption to be 55 gallons with a standard deviation of 22 gallons.
(a-1) What is the value of the population mean?
Population mean
(a-2) What is the best estimate of this value?
Estimate population mean
(c) For a 90 percent confidence interval, what is the value of t? (Round your answer to 3 decimal places.)
Value of t
(d) Develop the 90 percent confidence interval for the population mean. (Round your answers to 3 decimal places.)

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