Mr Brown a small-scale manufacturer of musical instruments thinks that the demand for guitars may be related to the number of television appearances by the popular group Maroon 5 during the previous month. He has collected the data shown in the following table (Round off to 3 decimal places) Demand for Guitars 3 6 7 5 10 7 Maroon 5 TV appearances 3 4 7 6 8 5 5.2.1 Using the least squares regression method derive a forecasting equation. Determine the estimate for guitar sales if Maroon 5 performed on TV nine times last month?