30 40 50 8 9 12 63 (a) By hand, draw a scatter diagram treating x as the explanatory variable and y as the response variable. Choose the correct scatter diagram below. O A. O B. O C. 70- 100- 70- 104 10 10 100 (b) Find the equation of the line containing the points (30,75) and (60,50). y =_x +(0) (Type integers or simplified fractions.) (c) Graph the line found in part (b) on the scatter diagram. Choose the correct graph below. O A. OB. O c. OD. 100- Ay 70- 100- Ay 70- 10 10 70 104 100 (d) By hand, determine the least-squares regression line. y =/x +(D (Round to three decimal places as needed.) (e) Graph the least-squares regression line on the scatter diagram. Choose the correct graph below