Students in a business statistics class were asked to do a project in which a “market basket” of food products was selected at random from those items offered in three grocery stores in Boise, Idaho:

Walmart, WinCo, and Albertsons. At issue was whether the mean prices at the three stores are equal or whether there is a difference in prices. The sample data are in the data file called Food Price Comparisons. Using an alpha level equal to 0.05, test to determine whether the three stores have equal population mean prices. If you conclude that there are differences in the mean prices, perform the appropriate post-test to determine which stores have different means.