Compute a 3-month weighted average forecast for months 4 through 9. Assign weights of 0.55, 0.33 and 0.12 to the months in sequence, starting with the most recent month. Compare the two forecasts using MAD. Which forecast is better the 3-month moving average or the 3-month weighted moving average and why?

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter13: Regression And Forecasting Models
Section13.4: Multiple Regression Models
Problem 13P: A trucking company wants to predict the yearly maintenance expense (Y) for a truck using the number...
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Compute a 3-month weighted average forecast for months 4 through 9. Assign weights of 0.55, 0.33 and 0.12 to the months in sequence, starting with the most recent month. Compare the two forecasts using MAD. Which forecast is better the 3-month moving average or the 3-month weighted moving average and why?

123456789
10
A
Month
1
2
3
4
5
6
7
8
9
B
C
Demand for Bronze Bearings 3-month Moving Average Error
50
100
60
80
140
100
90
120
70
80
93.33333333
106.6666667
110
103.3333333
D
10
60
E
10
Error²
100
3600
6.666666667 44.4444444
-16.66666667 277.777778
100
-103.3333333 10677.7778
Transcribed Image Text:123456789 10 A Month 1 2 3 4 5 6 7 8 9 B C Demand for Bronze Bearings 3-month Moving Average Error 50 100 60 80 140 100 90 120 70 80 93.33333333 106.6666667 110 103.3333333 D 10 60 E 10 Error² 100 3600 6.666666667 44.4444444 -16.66666667 277.777778 100 -103.3333333 10677.7778
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