Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weeks: Week 2 4 8 9. 10 11 12 Actual Passenger Miles (in thousands) 17 21 19 23 18 16 20 18 22 20 15 22 a) Assuming an initial forecast for week 1 of 17,000 miles, use exponential smoothing to compute miles for weeks 2 through 12. Use a = 0.2 (round your responses to two decimal places). Week 3 4 8 10 11 12 Forecasted Passenger Miles (in thousands) 17.00 17.00 17.80 18.04 19.03 18.83 18.26 18.61 18.49 19.19 19.35 18.48 b) The MAD for this model = 2.38' (round your response to two decimal places). c) Compute the cumulative forecast errors, cumulative MAD, and tracking signals (round your responses to two decimal places). Cumulative Cumulative Forecast Tracking Signal Forecast Tracking Signal Week Errors MAD Week Errors MAD 0.00 0.00 8.04 2.25 3.57 4.00 2.00 2.00 7.43 2.05 3.63 5.20 1.73 3.00 10.94 2.21 4.96 4 10.16 2.54 4.00 10 11.75 2.07 5.68 9.13 2.24 4.08 11 7.40 2.28 3.25 6.30 2.34 2.70 12 10.92 2.38 4.59 The control limits for the tracking signal are set at ±4MADS. The tracking signal is not within acceptable limits.
Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weeks: Week 2 4 8 9. 10 11 12 Actual Passenger Miles (in thousands) 17 21 19 23 18 16 20 18 22 20 15 22 a) Assuming an initial forecast for week 1 of 17,000 miles, use exponential smoothing to compute miles for weeks 2 through 12. Use a = 0.2 (round your responses to two decimal places). Week 3 4 8 10 11 12 Forecasted Passenger Miles (in thousands) 17.00 17.00 17.80 18.04 19.03 18.83 18.26 18.61 18.49 19.19 19.35 18.48 b) The MAD for this model = 2.38' (round your response to two decimal places). c) Compute the cumulative forecast errors, cumulative MAD, and tracking signals (round your responses to two decimal places). Cumulative Cumulative Forecast Tracking Signal Forecast Tracking Signal Week Errors MAD Week Errors MAD 0.00 0.00 8.04 2.25 3.57 4.00 2.00 2.00 7.43 2.05 3.63 5.20 1.73 3.00 10.94 2.21 4.96 4 10.16 2.54 4.00 10 11.75 2.07 5.68 9.13 2.24 4.08 11 7.40 2.28 3.25 6.30 2.34 2.70 12 10.92 2.38 4.59 The control limits for the tracking signal are set at ±4MADS. The tracking signal is not within acceptable limits.
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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Transcribed Image Text:Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weeks:
Week
2
4
8
9.
10
11
12
Actual Passenger Miles (in thousands)
17
21
19
23
18
16
20
18
22
20
15
22
a) Assuming an initial forecast for week 1 of 17,000 miles, use exponential smoothing to compute miles for weeks 2 through 12. Use a = 0.2 (round your responses to two decimal places).
Week
3
4
8
10
11
12
Forecasted Passenger Miles
(in thousands)
17.00 17.00 17.80 18.04 19.03 18.83 18.26
18.61 18.49 19.19
19.35 18.48
b) The MAD for this model = 2.38' (round your response to two decimal places).
c) Compute the cumulative forecast errors, cumulative MAD, and tracking signals (round your responses to two decimal places).
Cumulative
Cumulative
Forecast
Tracking
Signal
Forecast
Tracking
Signal
Week
Errors
MAD
Week
Errors
MAD
0.00
0.00
8.04
2.25
3.57
4.00
2.00
2.00
7.43
2.05
3.63
5.20
1.73
3.00
10.94
2.21
4.96
4
10.16
2.54
4.00
10
11.75
2.07
5.68
9.13
2.24
4.08
11
7.40
2.28
3.25
6.30
2.34
2.70
12
10.92
2.38
4.59
The control limits for the tracking signal are set at ±4MADS. The tracking signal is not within acceptable limits.
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