In an effort to increase unit sales of particular products in the short run, many supermarkets reduce the price of these products and increase their display space. Consider three levels of each factor: for the price factor, (1) normal price, (2) moderately reduced price, and (3) heavily reduced price; and for the display factor, (1) normal display space, (2) moderately increased display space, and (3) heavily increased display space. Suppose that each of these nine treatment combinations was applied five times to a specific product at a particular supermarket. Each treatment application lasted 7 days, and the dependent variable was unit sales for the week. The data for this experiment are listed in the file P19_38.xlsx. Test for any significant main effects and interactions at the 1% level, and briefly summarize your results.
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