The manager of a utility company in the Texas panhandle wants to develop quarterly forecasts of power loads for the next year. The power loads are​ seasonal, and the data on the quarterly loads in megawatts​ (MW) for the last four years are as​ follows:                                                                                            Quarter Year 1 Year 2 Year 3 Year 4 1 102.9 90.9 121.8 108.5 2 128.4 119.4 157.6 139.9 3 142.2 144.8 165.6 145.6 4 169.8 155.9 181.7 169.0   The manager estimates the total demand for the next year at 732MW. Use the multiplicative seasonal method to develop the forecast for each quarter.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter13: Regression And Forecasting Models
Section13.7: Exponential Smoothing Models
Problem 28P: The file P13_28.xlsx contains monthly retail sales of U.S. liquor stores. a. Is seasonality present...
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The manager of a utility company in the Texas panhandle wants to develop quarterly forecasts of power loads for the next year. The power loads are​ seasonal, and the data on the quarterly loads in megawatts​ (MW) for the last four years are as​ follows:
                                                                                          
Quarter
Year 1
Year 2
Year 3
Year 4
1
102.9
90.9
121.8
108.5
2
128.4
119.4
157.6
139.9
3
142.2
144.8
165.6
145.6
4
169.8
155.9
181.7
169.0
 
The manager estimates the total demand for the next year at 732MW. Use the multiplicative seasonal method to develop the forecast for each quarter.
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