The owner of an online video rental service has recorded the following rentals each week: Week: Rentals 1 2 3 4 5 6 7 8 1598 1357 1603 1356 1659 1541 1286 1395 a. Use a three week moving average to forecast sales for each of the weeks 4 through 9. (Round your answer to 2 decimal places.) Forecast Week 4 5 5 7 8 9 b. Use a four-week moving average to forecast sales for each of the weeks 5 through 9. (Round your answer to 2 decimal places.) Forecast Week 5 6 7 8 9 c. Using error data from only Periods 5-8 for both forecast methods, which forecast method would you recommend based on the MAD measure? . 4 week moving average 3 week moving average