The table below outlines sales data for machine equipment across four yearly quarters. Following the Seasonal...
The table below outlines sales data for machine equipment across four yearly quarters. Following the Seasonal Forecasting method, calculate the seasonal index for quarter 3 in year 2.
| Quarter | Year 1 | Year 2 | |
| Quarter 1 | 100 | 120 | |
| Quarter 2 | 180 | 140 | |
| Quarter 3 | 190 | 195 | |
| Quarter 4 | 150 | 160 | |
| Total | Total | ||
| 620 | 615 |
Homework Answers
Seasonal Index is the ratio of average value in a seaon to overall average value
Overall average sales = 
= 
Average Sales = 
=
154.375
Seasonal Average for Quarter 3 = 
= 
= 
Seasonal Average for Q3 = 192.5
Thus, Seasonal Index for Q3 Year 2 = 
= 1.247
Thus Seasonality Index for Quarter 3 in year 2 is 1.247
Seasonality Index above 1 indicates the demand in that season is above average.
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The table below
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Quarter
Year 1
Year 2
Year 3
1
4
6
7
2
2
4
6
3
3
5
7
4
5
7
8
Which of the following is the correct time series plot?
a.
b.
c.
Show the four-quarter and centered moving average values for
this time series (to 3 decimals if necessary).
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Time Series Value
Four-Quarter Moving Average
Centered Moving Average
1
1
4
2
2
3
3
4
5
2...
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Consider the following time series data.
Quarter
Year 1
Year 2
Year 3
1
4
6
7
2
2
4
6
3
3
5
7
4
5
7
8
Which of the following is the correct time series plot?
a.
b.
c.
Show the four-quarter and centered moving average values for
this time series (to 3 decimals if necessary).
Year
Quarter
Time Series Value
Four-Quarter Moving Average
Centered Moving Average
1
1
4
2
2
3
3
4
5
2...
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