Question: Table P-18 contains data values that represent the monthly sales of all retail stores in the United States in billions of dollars. Using the data

Table P-18 contains data values that represent the monthly sales of all retail stores in the United States in billions of dollars. Using the data through 1994, perform a decomposition analysis of this series. Comment on all three components of the series. Forecast retail sales for 1995 and compare your results with the actual values provided in the table.

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