Estimate a multiple linear regression model that predicts mpg (Y) from horsepower (X1) and acceleration (X2). Regression results suggest that __________. One unit increase in horsepower is associated with about 0.19 units increase in mpg One unit increase in mpg is associated with about 0.19 units increase in horsepower One unit increase in mpg is associated with about 0.19 units decrease in horsepower One unit increase in horsepower is associated with about 0.19 units decrease in mpg