Vacation destinations often run on a seasonal basis, depending on the primary activities in that location. Amanda Wang is the owner of a travel agency in Cincinnati, Ohio. She has built a database of the number of vacation packages (Vacation) that she has sold over the last twelve years. The accompanying table contains a portion of quarterly data on the number of vacation packages sold.

Year	Quarter	Vacation
2008	1	540
2008	2	187
2019	4	963

Click here for the Excel Data File a.Estimate the linear regression models using seasonal dummy variables with and without the trend term. Which is the preferred model?(Negative values for regression coefficients should be indicated by a minus sign. Round your answers to 2 decimal places.)