Compute the MAD and tracking signal for each period.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
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A manager uses a trend equation plus quarterly relatives to predict demand. Quarter relatives are SR1  = 0.9, SR2 = 0.95, SR3 = 1.05, and SR4 = 1.1. The trend equation is: Ft = 6 + 4t. Over the past nine quarters, demand has been as follows:
 

Period, t: 1 2 3 4 5 6 7 8 9
Demand: 11 15 17 22 28 32 36 39 43
 

 
Compute the MAD and tracking signal for each period. (Negative values should be indicated by a minus sign. Round your intermediate calculations and final answers to 3 decimal places.)
 

Period, t Demand MAD Tracking signal
1 11    
2 15    
3 17    
4 22    
5 28    
6 32    
7 36    
8 39    
9 43    
 
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