A BMW car dealer in Sicilia, Italy, has the following monthly new car sales data for January through December 2014. The dealer believes that new car sales follow a monthly seasonal pattern and computed the seasonal indices for each of the 12 months, which are also given in the following table:

1. Plot the car sales data. Does there appear to be a trend?

2. Deseasonalize the actual car sales to isolate the trend component.

3. Develop a linear trend equation using the deseasonalized data.

4. Develop a trend forecast for January and February 2015.

5. Develop a seasonalized forecast for January and February 2015.

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Month 1 4. 10 11 12 New Car Sales SeAsonal Inderes 742 785 990 798 740 830 900 890 1.35 840 720 695 920 O A5 O R5 065 100 0 96 1.30 135 120 130 09