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Seasonal Variation

This topic has 1 reply, 2 voices, and was last updated 10 years ago by mrjonbain.

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January 10, 2016 at 7:03 am #293954
ggg1
Member
- Topics: 4
- Replies: 1
In a time series analysis, the additive model is used to forecast sales and the following seasonal variations
apply:
Quarter 1 2 3 4
Seasonal variation +5.8 -8.4 +10.2 ?
The seasonal variation for quarter 4 is:
A +7.6
B -8.1
C -7.6
D +8.1
How to get answer C
Let me get the answer .. Thank you
January 10, 2016 at 4:40 pm #294033
mrjonbain
Moderator
- Topics: 6
- Replies: 2558
If you sum the variations given you should get 7.6.
5.8+10.2-8.4=7.6.
The seasonal variations should add up to zero.Therefore,the final seasonal variation must equal -7.6.
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