Refer to the previous exercise for a description of the data set. a. Estimate a linear trend

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Refer to the previous exercise for a description of the data set. 

a. Estimate a linear trend model with seasonal dummy variables. 

b. Estimate a quadratic trend model with seasonal dummy variables. 

c. Use the appropriate model to make quarterly forecasts for 2009.

Data from previous exercise

Year Quarter Revenue 2001 1.403683 2001 1.287625 2008 4 1.097712

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