3.2 Weekly sales of a vehicle for a dealer for the past 12 weeks are Week Sales 1 2 3 4 5 6 7 8 9 10 11 12 20 24 18 14 25 20 18 21 24 22 28 32 a. The manager would like to predict the sales for the coming week. Use a 3-week moving average. b. Also, find out whether or not a 2-week moving average is bet- ter than a 3-week moving average or moving average of longer periods. (Hint: Use mean absolute deviation.) c. Compare the graph (week versus sales) for actual data, 2-week moving average, and 3-week moving average