DEMAND IN MEGAWATTS MONTH LAST YEAR THIS YEAR January 17 February 14 March 10 20 April 13 23 May 18 30 June 15 38 July 23 44 August 26 41 September 21 33 October 15 23 November 12 26 December 14 17

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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CEO John Goodale, at Southern Illinois Power and Light,
has been collecting data on demand for electric power in its
western subregion for only the past 2 years. Those da ta are
shown in the ta ble below.
To plan for expansion and to arrange to borrow power
from neighboring utilities during peak periods, Goodale
needs to be able to forecast demand for each month next
year. However, the standard forecasting models discussed in
this chapter will not fit the data observed for the 2 years.
a) What are the weaknesses of the standard forecasting techniques
as applied to this set of data?
b) Because known models a re not appropriate here, propose
your own approach to forecasting. Although there is no
perfect solution to tackling data such as these (in other
words, there are no 100% right or wrong answers), justify your model.
c) Forecast demand for each month next year using the
model you propose.
DEMAND IN MEGAWATTS
MONTH
LAST YEAR THIS YEAR
January
17
February
14
March
10
20
April
13
23
May
18
30
June
15
38
July
23
44
August
26
41
September
21
33
October
15
23
November
12
26
December
14
17
Transcribed Image Text:DEMAND IN MEGAWATTS MONTH LAST YEAR THIS YEAR January 17 February 14 March 10 20 April 13 23 May 18 30 June 15 38 July 23 44 August 26 41 September 21 33 October 15 23 November 12 26 December 14 17
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