Construct the four-quarter centered moving average

Reference no: EM13995475

The state of Texas has reported the following quarterly gross sales for the in-state accommodation and food services industry for the years 2004-2008.

Source: Texas Comptroller of Public Accounts site, ecpa.cpa.tx.us, August 22, 2009.

Gross Sales ($ Billions)

	I	II	III	IV
2004	$7.014	7.330	7.260	7.521
2005	7.441	7.904	7.716	8.228
2006	8.166	8.390	8.321	8.751
2007	8.642	9.322	9.136	9.599
2008	9.412	9.879	9.578	9.995

a. Construct the four-quarter centered moving average for these data and determine the percentages of the moving average for the quarters.

b. Determine the seasonal indexes for the quarters.

c. Use the seasonal indexes to deseasonalize the original time series.

Reference no: EM13995475

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