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 5 7 7 7 6 Demand for Guitars 2 5 7 4 11 7 This exercise contains only parts? b, c, and d. Part 2 ?b) Using the? least-squares regression? method, the equation for forecasting is ?(round your responses to four decimal ?places)?: