Question: 15 Data collected on the yearly demand for 50-pound bags of fertilizer at Wallace Garden Supply are shown in the following table. Develop a 3-year moving average to forecast sales. Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other 2 years are each given a weight of 1. Which method do you think is best?

DEMAND FOR FERTILIZER

YEAR (1,000S OF BAGS)

1 4

2 6

3 4

4 5

5 10

6 8

7 7

8 9

9 12

10 14

11 15