Motor Trend magazine collected the horsepower and mileage for 32 cars in the 1973-74 model year. To see if there is any relationship between horsepower and mileage, I construct a scatterplot of the two variables.
From the above plot, we can see that there is negative association between horsepower and mileage for 32 cars. That is, as the horsepower increases, mileage for 32 cars decreases and vice versa.