Mark? Gershon, owner of a musical instrument? distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon 5 during the previous month. Gershon has collected the data shown in the following?, table Maroon 5 tv Appearances,; 4,3,8,6,9,6. demand for guitars 2,5,7,4,9,7;Using the? least-squares regression? method, the equation for forecasting is.