3. The marketing manager of a large supermarket chain would like to determine the effect of shelf space on the sales of pet food. The given information is collected from the 12 equal sized stores: Store Shelf Space, Weekly Sales, X (Feet) Y (Hundreds of Dollars) 1 5 1.6 2 5 2.2 3 5 1.4 4 10 1.9 5 10 2.4 6 10 2.6 7 15 2.3 8 15 2.7 9 15 2.8 20 2.6 11 20 2.9 12 20 3.1 10 cicile (b) Interpret the meaning of b, in this problem. (c) Predict the average weekly sales of pet food for stores with 8 feet of shelf space for pet food