The scatterplot shows, for 2013 cars, the carbon footprint (tons of CO2 per mile) vs. the new Environmental Protection Agency (EPA) high-way mileage for 76 family sedans as reported by the U.S. government There are seven cars (two points in the scatterplot are pairs of overlapping cars) with high highway mpg and low carbon footprint. They are all hybrids.
a) The correlation is —0.959. Describe the association.
b) Are the assumptions and conditions met for computing correlation?
c) Using technology, find the correlation of the data when the hybrid cards are not included with the others. Can you explain why it changes in that way?

  • CreatedMay 14, 2015
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