Tourism was hit hard by the international financial crisis that began in the fall of 2008. According to the Bureau of Economic Analysis (December 20, 2010), tourism spending has picked up, but it still remains below its peak, which occurred in 2007. The accompanying table shows a portion of seasonally adjusted data on real tourism spending (in millions of $).

a. Construct seasonal indices for the data.

b. Plot the seasonally adjusted series. Estimate the cubic trend model on the seasonally adjusted series.

c. Use the seasonal and the trend components to forecast tourism spending for the fourth quarter of 2010 and the first three quarters of 2011.

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Quarter Year Spending 665924 2004 672678 2004 695917 2010 3