| Age | Mileage |
| 6 | 53808 |
| 7 | 82838 |
| 11 | 115903 |
| 6 | 54903 |
| 8 | 77564 |
| 10 | 95911 |
| 4 | 40686 |
| 12 | 126675 |
| 15 | 167636 |
| 14 | 128798 |
| 10 | 96589 |
| 5 | 35049 |
A used car dealer wants to develop a regression equation thatdetermines mileage as a function of the age of a car in years. Hecollects the data shown below for the 12 cars he has on hislot.
a) What is the slope of the regression equation? Give youranswer to two decimal places. Â
b) What is the value of the correlation coefficient? Give youranswer to two decimal places. Â
c) A 4 year old car is delivered to his lot with 160000 miles.Manually enter these values in the data table above and rerun theregression analysis. What is the value of the slope? Give youranswer to two decimal places. Â
d) Including the additional car, what is the value of thecorrelation coefficient? Give your answer to two decimalplaces. Â
e) Did the additional car strengthen or weaken the linearrelationship between age and mileage?
It strengthened the linear relationship.
It weakened the linear relationship.
   Can not be determined.
