Assignment:
North Dakota Electric Company estimates its demand trend line (in millions of kilowatt hours) to be:
D= 77 +0.43Q
where Q refers to the sequential quarter number and Q=1 for winter of year 1. In addition, the multiplicative seasonal factors are as follows:
| Quarter |
Factor (index) |
| winter |
.8 |
| spring |
1.1 |
| summer |
1.4 |
| fall |
.7 |
Find the forecast of for the four quarters of year of 17.