6. Which of the following statements concerning the least squares regression of Y on X depicted in the graph below is TRUE? 80 75- 70 65 60 55 50 10 20 30 50 60 70 40 X a. The point (20,70) is very influential and has a large residual. b. The point (20,70) is very influential but has a small residual. The point (20,70) is not influential but has a large residual. d. The point (20,70) is not influential and has a small residual