Consider the costello Music company problem in exercise 48. the quarterly sales data follow.

a. Use the following dummy variables to develop an estimated regression equation to account for any seasonal and linear trend effects in the data: Qtr1 = 1 if Quarter 1, 0 otherwise; Qtr2 = 1 if Quarter 2, 0 otherwise; and Qtr3 = 1 if Quarter 3, 0 otherwise.
b. Compute the quarterly forecasts for next year.

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Total Yearly Sales 12 28 34 50 76 4 4 14 16 10 12 18 4 103 13 35