In a comparison of the prices of items at five supermarkets, six items were randomly selected and the price of each was recorded for each of the five supermarkets. The objective of the study was to see whether the data indicated differences in the levels of prices among the five supermarkets. 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 α = .05.

b. Find the approximate p-value for the test and interpret it.

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Kash n' Food Publix Dixie Albertsons 4 Less Winn- Item Karry Celery Colgate toothpaste Campbell's beef soup Crushed pineapple Mueller's .33 34 69 .59 .58 1.28 1.49 1.44 1.37 1.28 1.05 1.19 1.23 1.19 1.10 .83 .95 .95 .87 84 spaghetti Heinz ketchup .68 79 83 .69 69 1.41 1.69 1.79 1.65 1.49