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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