Question: In Exercise 11.43 (and data set EX1143), we compared the regular prices at four different grocery stores for eight items purchased on the same day.

In Exercise 11.43 (and data set EX1143), we compared the regular prices at four different grocery stores for eight items purchased on the same day. The prices are listed in the table.

a. Does the distribution of the prices differ from one supermarket to another? Test using the Friedman Fr-test with Î± =.05.
b. Find the approximate p-value for the test and interpret it.

Store Vons Ralphs Stater Bros WinCo Items Salad mix, 12 oz. bag 3.99 2.79 1.99 1.78 Hillshire Farm Bee Kellogg's Raisin Kraft Philadelphia Kraft Ranch TreeTop Apple Dial Bar Soap, Jif Peanut Butter, Smoked Sausage, 14 oz. 4.29 4.29 3.99 250 Bran 25.5 oz. Cream Cheese, 8 oz. 2993.19 2.79 Dressing, 16 oz. Juice, 64 oz. Gold, 8-4 oz. Creamy, 28 oz. 4.49 5.49 4.49 3.15 1.48 1.48 1.58 5.14 5.15 5.49 4.79 4.34 3.19 3.49 3.49 2.99 3.49 3.49 5.99 6.495.79

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