Wegmans Food Markets and Tops Friendly Markets are the major grocery chains in the Rochester, New York, area. When Wal-Mart opened a Supercenter in one of the Rochester suburbs, experts predicted that Wal-Mart would undersell both local stores. The Democrat and Chronicle obtained the price data in the following table for a 15-item market basket (Democrat and Chronicle, March 17, 2002).

At the .05 level of significance, test for any significant difference in the mean price for the 15-item shopping basket for the three stores.

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Item Tops 0.49 0.60 10.47 1.99 1.59 2.59 0.67 2.29 1.34 3.29 2.09 3.29 6.79 2.50 1.19 Wal-Mart Bananas (1 Ib.) Campbell's soup (10.75 oz.) Chicken breasts (3 lbs.) Colgate toothpaste (6.2 oz.) Large eggs (1 dozen) Heinz ketchup (36 oz.) Jell-O (cherry, 3 oz.) Jif peanut butter (18 oz.) Milk (fat free, 1/2 gal.) Oscar Meyer hotdogs (1 lb.) Ragu pasta sauce (1 Ib., 10 oz.) Ritz crackers (1 lb.) Tide detergent (liquid, 100 oz.) Tropicana orange juice (1/2 gal.) Twizzlers (strawberry, 1 lb.) Wegmans 0.49 0.77 8.07 1.97 0.79 2.59 0.65 2.09 1.34 3.39 1.25 3.39 5.99 2.50 1.69 0.48 8.61 2.40 0.88 1.78 0.42 1.78 1.24 1.50 1.50 2.00 5.24 1.27