Question 10.38

10.38 Highway MPG and CO2 Emissions.

Let’s investigate the relationship between highway miles per gallon (MPGHWY) and CO2 emissions for premium gasoline cars as reported by Natural Resources Canada.17

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  1. Make a scatterplot of the data and describe the pattern.
  2. Plot MPGHWY versus the logarithm of CO2 emissions. Are these points closer to a straight line?
  3. Regress MPGHWY by the logarithm of CO2 emissions. Give a 95% confidence interval for the slope of the population regression line. Describe what this interval tells you in terms of percent change in CO2 emissions for every one mile increase in highway mpg.