Cars These data are described in Exercise 45.
(a) Make a scatterplot of weight and highway mileage. Which variable do you think makes the most sense to put on the
-axis, and which belongs on the
-axis?
(b) Describe any pattern that you see in the plot. Be sure to identify any outliers.
(c) Find the correlation between these two variables.
(d) Use the correlation line to estimate the mileage of a car that weighs 4,000 pounds. Does this seem like a sensible procedure?
Exercise 45
Cars These data report characteristics of 196 types of cars sold in the United States in 2012. One column gives the official mileage (combined MPG), and another gives the rated horsepower.
(a) Make a scatterplot of these two columns. Which variable makes the most sense to put on the
-axis, and which belongs on the
-axis?
(b) Describe any pattern that you see in the plot. Be sure to identify any outliers. (c) Find the correlation between these two variables.
(d) Interpret the correlation in the context of these data. Does the correlation provide a good summary of the strength of the relationship?
(e) Use the correlation line to estimate the mileage of a car with 200 horsepower. Does this seem like a sensible procedure? What if the car has a 1.5 liter engine?