How does the coefficient of determination help as a goodness of fit tool in regression analysis? Multiple choice question. It multiplies the percentage of the variation in Y that is not explained by the sample regression equation. It gives the percentage of the variation in Y explained by the sample regression equation. It indicates the percentage of the variation in Y that is not explained by the sample regression equation.ation is: Price = 10,000 - 1800Age - 50Mileage + 1200Cylinders. By how much will the price be reduced for each additional 10,000 miles on the car? (Please enter one word per blank.)