1. A consumer advocate wishes to know whether children are affected by Joe Camel cigarette ads. He designs a study of the reactions of 50 children to the ads. What is the sample and what is the population?
2. A polling agency samples 1000 "likely voters" and concludes that 40% of all voters will vote for Candidate A. What's the sample and what's the population?
3. There is currently a debate between the two main political parties and including the Executive Branch as to how the U.S. population Census should be carried out. Many Republicans say that the Constitution insists that the Census be an "enumeration", which they define as a headcount of all people in the U.S. and all U.S. citizens. If this were done, what would be the sample and what would be the population?