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The sales (in $'000) of CBO by a large department store for each period of three months are as follows. Quarter 20X4 20X5 20X6 20X7
The sales (in $'000) of CBO by a large department store for each period of three months are as follows.
| Quarter | 20X4 | 20X5 | 20X6 | 20X7 |
| First |
| 8 | 20 | 40 |
| Second |
| 30 | 50 | 62 |
| Third |
| 60 | 80 | 92 |
| Fourth | 24 | 20 | 40 |
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Required
(a) Using an additive model, find the centred moving average trend.
(b) Find the average seasonal variation for each quarter.
(c) Predict sales for the last quarter of 20X7 and the first quarter of 20X8, stating any assumptions
Show your workings more so in part b
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