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. A 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 for all stores. 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: Berenson, Levine, and Krehbiel (2002, 405). AISLE LOCATION Front Middle Rear8.6 3.2 4.67.2 2.4 6.05.4 2.0 4.06.2 1.4 2.85.0 1.8 2.24.0 1.6 2.8 a. At the 5% level of significance, is there evidence of a significant difference in average sales among the various aisle locations?b. If appropriate, which aisle locations appear to differ significantly in average sales?c At the 5% level of significance, is there evidence of a significant difference in the variation in sales among the various aisle locations? d. what should the retailing manager conclude? fully describe the retailing berenson, levine, and krehbiel (2022, 406)