A company that sells musical instruments has been in business for five years. During that time, sales of planos increased from 12 units in the first year to 77 units in the most recent year. The firm's owner wants to develop a forecast of plane sales for the coming year. The quarterly sales data follow Total Yearly Sales 12 Year 1 3 Quarter 1 Quarter 2 4 7 12 19 2 4 2 9 10 Quarter 3 1 4 5 7 13 Quarter 4 14 16 planos piance pianos pianos 22 35 29 35 50 (a) Use the following dummy variables to develop an estimated regression equation to account for any seasonal and linear trend effects in the data: 1 f quarter 1, 0 others: 1 if quarter 2.0 otherwise; and ₂-1 if quarter 3, 0 otherwise. (Lett-1 denete the time series value in quarter 1 of year 12 year 1 and -20 denote the time series value in quarter 4 of year 5. Round your numerical values to be decimal places) 8- (b) Compute the quarterly forecasts for next year (Round your answers to the nearest integer) forecast for quarter 1 forecast for quarter 2 forecast for quarter 3 forecast for quarter 4 - 2 denate the time series value in q

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