Refer to the CIA data, which report demographic and economic information on 46 countries.

a. Develop a contingency table that shows G-20 membership versus level of petroleum activity. Is there a significant association at the .05 level of significance between these variables?

b. Group the countries into “young” (percent of population over 65 is less than 10) and “old” (percent of population over 65 is more than 10). Then develop a contingency table between this age variable and the level of petroleum activity. At the .05 level of significance can we conclude these variables are related?