These data give the amount of CO2 produced in 40 nations along with the level of economic activity, both in 2009. CO2 emissions are given in millions of metric tons. Economic activity is given by the gross domestic product (GDP), a summary of overall economic output. Both variables are from the International Energy Agency.
(a) Make a scatterplot of CO2 emissions and GDP. Which variable have you used as the response and which as the explanatory variable?
(b) Describe any association between CO2 emissions and GDP.
(c) Find the correlation between CO2 emissions and GDP.
(d) Which cases are outliers? How does the correlation change if outliers are removed?