For the OECD data file for OECD nations in Table 3.13 on page 70, use software to construct a scatterplot relating x = carbon dioxide emissions and y = prison population.

(a) Based on this plot, identify a point that has a large influence in determining the correlation. Show how the correlation changes if you remove this observation from the data set.

(b) Suppose you constructed this plot using UN data for all nations, rather than only the highly economically advanced nations that form the OECD. Would you expect the correlation to be weaker, about the same size, or stronger?Why?

Concepts and Applications