The owner of an online video rental service has recorded the following rentals each week:
Week 1 2 3 4 5 6 7 8
Rentals 1202 1503 1444 1254 1609 1499 1689 1555
A. Use a three-week moving average to forecast sales for each of the weeks 4 through 9.
B. Use a four-week moving average to forecast sales for each of the weeks 5 through 9.
C. Compare the forecasts created by these two methods using mean absolute deviation. Which forecasting method would you recommend?