6.29 RETAIL MILK PRICE REPORT. Each month the US Department of Agriculture produces the Retail Milk RMPR Prices Report. The report lists the retail prices of milk for selected cities. The December 2019 prices ( dollars per gallon) for conventional whole milk for 10 US cities are listed in the accompanying table. A dairy farmer is interested in knowing true mean December 2019 retail whole milk price for all US cities. US City Price ($/gallon) Atlanta, GA 3.72 Boston, MA 3.32 Cincinnati, OH 3.09 Dallas, TX 2.59 Detroit, MI 2.72 Miami, FL 4.02 New Orleans, LA 3.95 Pittsburgh, PA 4.34 Syracuse, NY 3.45 Washington, DC 3.82 a. Identify the dairy farmer's target parameter. b. Compute a point estimate of the target parameter. c. What is the problem with using the normal (z) statistic to find a confidence interval for the target parameter? d. Find a 95% confidence interval for the target parameter. e. Give a practical interpretation of the interval, part d. f. What conditions must be satisfied for the interval, part d, to be valid