Prairie Flower Cereal, Inc., is a small, but growing, producer of hot and ready-to-eat breakfast cereals. Gordon Thorson, a successful grain farmer, started the company in 1910 (Carlson 1997). Two machines are used for packaging 18-ounce (510-gram) boxes of sugar-coated wheat cereal. Estimate the difference in the mean weights of boxes of this type of cereal packaged by the two machines. Use a 95% confidence level and the data file Sugar Coated Wheat. Explain your findings.