Regression ABC Co. has several cars that have been purchased for used by their sales staff. The company has been keeping careful track of the mileage and total cost for each auto per month. The controller has collected this data and run a simple regression analysis using it. The following is a portion of the output: Regression Statistics Multiple R 0.679819199 R Square 0.660045662 Adjusted R Square 0.65505137 Standard Error 95.47032698 Observations 10 Coefficients Intercept 2541.666667 mileage 120.8333333 Standard Error 92.23309842 8.71520861 t Stat ? ? mileage Residual Plot mileage Line Fit Plot 400 6000 4000 8 2000 Residuals 0 cost Predicted cost 15 20 0 5 15 20 -200 10 mileage 10 mileage a) What is the t-Stat for the b-coefficient? What is the cost function for mileage and automobile