QUESTION 6 A mechanic was interested to see how a car engine's horsepower impacts the car's mpg fuel officiency. The mechanic used to following information to construct a linear regression line that relates horsepower (independent variable) and mpg (dependent variable) The sample of cars had a mean horsepower of 266 and mean mpg of 28 The sample standard deviation for horsepower was 118 and sample standard deviation for mpg was 17 The correlation between horsepower and mpg is -0.61 Calculate the slope of the linear regression line. (round your final answer to two decimal places)