Chapter 4, Question 29 (correction: the question is asking for the quarters following year 25 not the quarters of year 25. Namely, quarters 101 to 104.): North Dakota Electric Company estimates its demand trend line (in millions of kilowatt hours) to be: D = 77 + 0.430 where Q refers to the sequential quarter number and Q 5 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 Forecast energy use for the four quarters of year 26 (namely quarters 101 to 104), beginning with winter. O Winter = 96.344 Spring = 169.806 Summer = 132.946 Fall = 85.204 Winter = 132.946 3 DD ADMIN Contra Costa Fresno S San Francisco VENTURA San JUTTIITICI LT Fall .7 Forecast energy use for the four quarters of year 26 (namely quarters 10 to 104), beginning with winter. O Winter = 96.344 Spring = 169.806 Summer = 132.946 Fall = 85.204 O Winter = 132.946 Spring = 96.344 Summer = 169.806 Fall = 85.204 O Winter = 96.344 Spring = 132.946 Summer = 169.806 Fall = 85.204 O Winter = 96.344 Spring = 132.946 Summer = 85.204 Fall = 169.806