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The following quarterly time series gives the number of units sold during 5 years at a boat dealership.


boat dealer.PNG

(a) Find the four-quarter centered moving averages.

(b) Plot the series and the moving averages on a graph.


(c) Compute the seasonal-irregular component.


(d) Compute the seasonal indexes for all four quarters.


(e) Compute the deseasonalized time series for sales.


(f) Fit a linear trend equation to the deseasonalized sales.


(g) Forecast the number of units sold in each quarter of Year 6 (using seasonal and trend components). 

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The following quarterly time series gives the number of units sold during 5 years at a boat dealership. (a) Find the four-quarter centered moving...
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