Data composed on the yearly demand for 50-pound bags of fertilizer at Wallace Garden Supply are given 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 previous year are given a weight of 2 and sales in the other 2 years are every given a weight of 1. Which method do you think is high quality?
Year Scale Fertilizer Demand
1 4
2 6
3 4
4 5
5 10
6 8
7 7
8 9
9 12
10 14
11 15