In the linear regression models we study in this course, y = a + x +...+B4x4 + e, which of the following statements concerning the marginal effect of x4 on y is most accurate: Select one: O a. O b. O c. It measures the amount of change for y when x4 increases by one unit. e. It measures the amount of change for y when x4 decreases by one unit. It measures the amount of change for y when x increases by one unit. d. It measures the amount of change for x4 when y increases by one unit. It measures the amount of change for y when x decreases by one unit.

In the linear regression models we study in this course, y=+1x1++4x4+e, which of the following statements concerning the marginal effect of x4 on y is most accurate: Select one: a. It measures the amount of change for y when x4 increases by one unit. b. It measures the amount of change for y when x4 decreases by one unit. C. It measures the amount of change for y when x1 increases by one unit. d. It measures the amount of change for x4 when y increases by one unit. e. It measures the amount of change for y when x1 decreases by one unit