15.40 Supermarket Prices 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 (in dollars) are listed in the table.

a. Does the distribution of the prices differ from one supermarket to another? Test using the Friedman F, test with a = 0.05.

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

Transcribed Image Text:

Food Item Celery Loblaws IGA Zehrs Basics No Frills 0.33 0.34 0.69 0.59 0.58 Colgate toothpaste 1.28 1.49 1.44 1.37 1.28 Campbell's beef soup 1.05 1.19 1.23 1.19 1.10 Crushed pineapple 0.83 0.95 0.95 0.87 0.84 Spaghetti 0.68 0.79 0.83 0.69 0.69 Heinz ketchup 1.41 1.69 1.79 1.65 1.49