Question 8 1 points Save Answer Suppose that a researcher estimated the following regression model: (3) y; = 5.03 + 4.28X; - 3.050; + 0.37X;Dj + 2; where Y is the time required to commute to workplace (in minutes), X is the distance to workplace (in kilometers], and Dis a dummy variable representing the mode of transportation (D; = 1 if individual ) drives to work, and 0 if i does not drive to work]. In this model, which of the following is appropriate as an interpretation of the coefficient for X? O a. It represents the average change in commute time when the distance increases by 1 km for people who do not drive to workplace. O b. It represents the average change in commute time when the distance increases by 1 km for people who drive to workplace. O c. It represents the average change in commute time when the distance increases by 1 km for both people driving to workplace and those not driving to workplace. O d. It represents the difference in average commute time between two individuals who commute the same distance but one drives and the other does not drive