Compute the exponentially smoothed forecast with a = 0.40, the adjusted exponentially smoothed forecast with a = 0.40 and 3 = 0.30, and the linear trend line forecast. Compare the accuracy of the three forecasts using cumulative error and MAD, and indicate which forecast appears to be most accurate.

Practical Management Science
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Author:WINSTON, Wayne L.
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Chapter2: Introduction To Spreadsheet Modeling
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12.7 The Intrepid mutual fund of growth stocks has had the following average monthly
price for the past 10 months.
Month
1
2
3
4
5
6
7
8
9
10
Fund Price
62.7
63.9
68.0
66.4
67.2
65.8
68.2
69.3
67.2
70.1
Compute the exponentially smoothed forecast with a = 0.40, the adjusted exponentially
smoothed forecast with a = 0.40 and ß = 0.30, and the linear trend line forecast.
Compare the accuracy of the three forecasts using cumulative error and MAD, and
indicate which forecast appears to be most accurate.
Transcribed Image Text:12.7 The Intrepid mutual fund of growth stocks has had the following average monthly price for the past 10 months. Month 1 2 3 4 5 6 7 8 9 10 Fund Price 62.7 63.9 68.0 66.4 67.2 65.8 68.2 69.3 67.2 70.1 Compute the exponentially smoothed forecast with a = 0.40, the adjusted exponentially smoothed forecast with a = 0.40 and ß = 0.30, and the linear trend line forecast. Compare the accuracy of the three forecasts using cumulative error and MAD, and indicate which forecast appears to be most accurate.
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