A used car dealer wants to develop a regression equation that determines mileage as a function of the age of a car ...

        A used car dealer wants to develop a regression equation   that determines mileage as a function of the age of a car in years. He   collects the data shown below for the 12 cars he has on his lot   Age Mileage     14 144310     8 77771     5 54031     13 127346     5 43492     14 141594     14 149135     15 145310     10 113424     6 64970     11 99453     12 119184           1)What   is the slope of the regression equation? Give your answer to two decimal   places.    2)What   is the value of the correlation coefficient? Give your answer to two decimal   places.    3)A   4 year old car is delivered to his lot with 160000 miles. Manually enter   these values in the data table above and rerun the regression analysis. What   is the value of the slope? Give your answer to two decimal places.    4)Including   the additional car, what is the value of the correlation coefficient? Give   your answer to two decimal places