Please show work for my understanding.

The retailing manager of a supermarket chain wants to determine whether product location has any effect on the sale of pet toys. Three different aisle locations are considered: front, middle, and rear.

Random sample of 18 stores is selected with 6 stores randomly assigned to each aisle location. The size of the display area and price of the product are constant.

At the end of a 1-month trial period, the sales volumes (in thousands of dollars) of the product in each store were as follows:

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