A study aims to test the effect of price discount and package size on the sales of saltine crackers. Three levels of discount (10%, 20% and 30%) and three package sizes (Small/Medium/Large) are...

A study aims to test the effect of price discount and package size on the sales of saltine

crackers. Three levels of discount (10%, 20% and 30%) and three package sizes (Small/Medium/Large)

are tested. Five stores are randomly assigned to each combination of discount and package

size. The sample means of sales in thousand dollars observed over an entire month for each

discount-size combination are reported in Table 1.