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A manufacturer of snow chain is considering building a new production plant to cope with growing demand. A tyre firm is interested in investing in the company and has been provided with the following quarterly sales figures:

Unit Sales: 1997-2000 (000s)

Year	Q1	Q2	Q3	Q4
1	441.1	397.7	396.1	472.8
2	476.4	454.4	450.8	553.5
3	580.7	573.2	571.6	703.6
4	692.0	676.5	659.9	752.8

1) Calculate the trend line using the moving average method.

2) Estimate and then eliminate the season variation component. In other words find the deseasonalised data.

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