Question 2 (25 marks) The marketing Manager of a large supermarket chain faced the business problem of determining the effect on the sales of specialty pet food of shelf space and whether the product was placed at the front (=1) or back (=0) of the aisle. Data are collected om a random sample of 12 equal-sized stores as seen on this table: Store Shelf Space Location Weekly Sales (Square feet) (S) 1 5 Back 1 60 2 5 Front 220 3 5 Back 140 4 10 Back 190 5 10 Back 240 6 10 Front 260 7 15 Back 230 8 15 Back 270 9 15 Front 280 10 20 Back 260 11 20 Back 290 12 20 Front 310