The quarterly sales for Costello Music Company data follow. They are also on the sheet piano sales.
Year Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Yearly Sales
1 4 2 1 5 12
2 6 4 4 14 28
3 10 3 5 16 34
4 12 9 7 22 50
5 18 10 13 35 76
Use the indicator variables to develop an estimated regression equation to account for any seasonal and linear trend effects in the data. What is your forecast for quarter 2 of year 6?