Political scientists use what term to refer to the proportion of either eligible or voting-age Americans who vote in a given election?

ALL BUT WHICH of the following are social factors that contribute to a country's power?

A. Productivity B. Image and reputation C. Education D. Distribution of skills E. Work ethic

Which sampling technique should be used when the population's members differ from one

another on several important characteristics? a) quota sampling b) simple random sampling c) systematic sampling d) stratified random sampling