Fitting a straight line to a set of data yields the following prediction line. Complete (a) through (c) below. * =7 + 9x a. Interpret the meaning of the Y-intercept, bo. Choose the correct answer below. O A. The Y-intercept, bo = 9, implies that when the value of X is 0, the mean value of Y is 9. B. The Y-intercept, bo = 7, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 7 units. OC. The Y-intercept, bo = 7, implies that when the value of X is 0, the mean value of Y is 7. OD. The Y-intercept, bo = 7, implies that the average value of Y is 7. b. Interpret the meaning of the slope, bq. Choose the correct answer below. O A. The slope, by = 9, implies that the average value of Y is 9. OB. The slope, by = 9, implies that for each increase of 1 unit in X, the value of Y is expected to decrease by 9 units. O C. The slope, by = 9, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 9 units. OD. The slope, by = 7, implies that for each increase of 1 unit in X, the value of Y is expected to increase by 7 units. c. Predict the mean value of Y for X= 3. ; = (Simplify your answer.)