(a) Plot the above data on a graph. Do you observe any trend, cycles, or random variations?

(b) Starting in year 4 and going to year 12, forecast demand using a 3-year moving average. Plot your forecast on the same graph as the original data.

(c) Starting in year 4 and going to year 12, forecast demand using a 3-year moving average with weights of .1, .3, and .6, using .6 for the most recent year. Plot this forecast on the same graph.

 

Year	Demand
1	7
2	9
3	5
4	9
5	13
6	8
7	12
8	13
9	9
10	11
11	7
12