Ten weeks of data on the Commodity Futures Index are 7.36, 7.41, 7.56, 7.57, 7.61, 7.53, 7.53, 7.71, 7.63, and 7.56. (a) Construct a time series plot. O Index Index 8.5 8.3 8.1 7.9 7.7 7.5 7.3 7.1 6.9 6.7 6.5 0 1 2 3 4 5 6 7 8 9 10 11 Week 1 8.5 8.3 8.1 7.9 7.7 7.5 7.3 7.1 6.9 6.7 6.5 2 66 Week 0 1 2 3 What type of pattern exists in the data? O The data appear to follow a horizontal pattern. The data appear to follow a cyclical pattern. The data appear to follow a trend pattern. The data appear to follow a seasonal pattern. Time Series Value 4 7.36 567 8 9 10 11 Week 7.41 a = 0.1 Forecast Index a = 0.3 Forecast Index (b) Use trial and error to find a value of the exponential smoothing coefficient a that results in a relatively small MSE. (Round your answers to two decimal places.) 8.5 8.3 a=0.8 Forecast 8.1 7.9 7.7- 7.5 7.3 7.1 6.9 6.7- 6.5 0 1 2 3 4 5 6 7 8 9 10 11 Week 8.5 8.3 8.1 7.9 7.7- 7.5- 7.3 7.1- 6.9 6.7 6.5 01 2 3 4 5 6 7 8 9 10 11 Week
Ten weeks of data on the Commodity Futures Index are 7.36, 7.41, 7.56, 7.57, 7.61, 7.53, 7.53, 7.71, 7.63, and 7.56. (a) Construct a time series plot. O Index Index 8.5 8.3 8.1 7.9 7.7 7.5 7.3 7.1 6.9 6.7 6.5 0 1 2 3 4 5 6 7 8 9 10 11 Week 1 8.5 8.3 8.1 7.9 7.7 7.5 7.3 7.1 6.9 6.7 6.5 2 66 Week 0 1 2 3 What type of pattern exists in the data? O The data appear to follow a horizontal pattern. The data appear to follow a cyclical pattern. The data appear to follow a trend pattern. The data appear to follow a seasonal pattern. Time Series Value 4 7.36 567 8 9 10 11 Week 7.41 a = 0.1 Forecast Index a = 0.3 Forecast Index (b) Use trial and error to find a value of the exponential smoothing coefficient a that results in a relatively small MSE. (Round your answers to two decimal places.) 8.5 8.3 a=0.8 Forecast 8.1 7.9 7.7- 7.5 7.3 7.1 6.9 6.7- 6.5 0 1 2 3 4 5 6 7 8 9 10 11 Week 8.5 8.3 8.1 7.9 7.7- 7.5- 7.3 7.1- 6.9 6.7 6.5 01 2 3 4 5 6 7 8 9 10 11 Week
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
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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:Ten weeks of data on the Commodity Futures Index are 7.36, 7.41, 7.56, 7.57, 7.61, 7.53, 7.53, 7.71, 7.63, and 7.56.
(a) Construct a time series plot.
1
2
3
4
What type of pattern exists in the data?
Week
5
The data appear to follow a horizontal pattern.
O The data appear to follow a cyclical pattern.
O The data appear to follow a trend pattern.
O The data appear to follow a seasonal pattern.
6
8.5-
8.3
8.1
7.9+
7
7.7
7.5-
8
7.3
7.1
6.9
6.7
6.5 +
01 23 4567 7 8 9 10 11
Week
9
8.5-
8.3-
10
8.1
7.9
7.7+
7.5-
7.3
7.1
6.9
6.7
6.5
0 1 2
Time Series
Value
7.36
7.41
7.56
(b) Use trial and error to find a value of the exponential smoothing coefficient a that results in a relatively small MSE. (Round
your answers to two decimal places.)
7.57
7.61
7.53
3 4
7.53
7.71
5 67 7 8 9 10 11
Week
7.63
7.56
a = 0.1
Forecast
α = 0.3
Forecast
J
C
O
Index
DIC
a = 0.8
Forecast
8.5
8.3-
8.1
7.9
7.7
7.5-
7.3
7.1
6.9
6.7
6.5
0
8.5 T
8.3-
8.1
7.9-
7.7-
7.5
7.3
7.1
6.9-
6.7-
6.5
1
2 3 4 5 678
Week
+
0 1 2 3 4
8 9 10 11
5 6
6 7 8
Week
9 10 11
What value of the smoothing constant provides the most accurate forecasts?
O Exponential smoothing with a = 0.3 provides more accurate forecasts since its MSE is smaller than the MSE for
a=0.1 or 0.8.
O Exponential smoothing with a = 0.8 provides more accurate forecasts since its MSE is smaller than the MSE for
a=0.1 or 0.3.
O Exponential smoothing with a = 0.1 provides more accurate forecasts since its MSE is smaller than the MSE for
α = 0.3 or 0.8.
All three values of the smoothing constant provide the same MSE, so none provide a more accurate forecast than the
others.
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