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: This exercise contains only parts b,c, and d. b) Using the least-squares regression method, the equation for forecasting is (round your responses to four decimal places): Y=0.4+0.9x c) The estimate for guitar sales if Maroon 5 performed on TV 10 times = sales (round your response to two decimal places). d) The correlation coefficient (r) for this model = (round your response to four decimal places)