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

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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). 

boat dealer.PNG

Top Answer

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1.png

Y .
baseline
Y /CMA
YuS.
Seasonal-Irregular Component
Seasonal Factors
Centered
Sales
Four Quarter
Moving
600
Year
Quarter
Sales
Moving Average| Average
Sht
St
Deasonsalize
300
1.11129
269.9573953...

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