In order to compare grocery prices of four different grocery stores on a particular day in November 1999, 11 randomly selected items with same brands are given in Table 12.20.
Use the data to determine whether there is a difference in prices at these four grocery store chains. Use α = 0.01. State any assumptions you have made to solve this problem.
Table 12.20 Grocery Prices by Store

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Store C Red apple (1 lb) Large eggs (1 dozen) Orange Juioe (64 oz) Cereal (15 oz) Canned corn (15.25 oz) Crystals sugar (5 lb) Frozen pizza (21.5 oz) Puppy Chow (4.4 lb)