Month Units Month Units May 100 September 105 June 80 October 110 July 110 November 125 August 115 December 120

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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Question

The monthly demand for units manufactured by the Acme Rocket Company has been as follows:

a. Use the exponential smoothing method to forecast the number of units for June to January. The
initial forecast for May was 105 units; a = 0.2.
b. Calculate the absolute percentage error for each month from June through December and the
MAD and MAPE of forecast error as of the end of December.
c. Calculate the tracking signal as of the end of December. What can you say about the performance
of your forecasting method?

Month
Units
Month
Units
May
100
September
105
June
80
October
110
July
110
November
125
August
115
December
120
Transcribed Image Text:Month Units Month Units May 100 September 105 June 80 October 110 July 110 November 125 August 115 December 120
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