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 45 gallons with a standard deviation of 20 gallons. Assume the population distribution is normal. (Use tDistribution Table.)

a-1. What is the value of the population mean? 20 48 Unknown a-2. What is the best estimate of this value? b. For a 90% confidence interval, what is the value of t ? (Round your answer to 3 decimal places.) Answer is complete and correct. c. What is the margin of error? (Round your answer to 3 decimal places.)