Question 2.37

2.37 Fuel efficiency and CO_2 emissions

In Example 2.7 (pages 70–71), we examined the relationship between highway MPG and CO2 emissions for 1067 vehicles for the model year 2014. Let’s examine the relationship between the two measures of fuel efficiency in the data set, highway MPG and city MPG.

  1. Make a scatterplot with city MPG on the x axis and highway MPG on the y axis.
  2. Describe the relationship.
  3. Calculate the correlation.
  4. Does this numerical summary give a good indication of the strength of the relationship between these two variables? Explain your answer.