1. When is it appropriate to use stratified random sampling? What are strata, and how should strata be selected?
2. When is cluster sampling used? Why do we describe this type of sampling by using the term cluster?
3. Explain how to take a systematic sample of 100 companies from the 1,853 companies that are members of an industry trade association.
4. Explain how a stratified random sample is selected. Discuss how you might define the strata to survey student opinion on a proposal to charge all students a $100 fee for a new university-run bus system that will provide transportation between off-campus apartments and campus locations.
5. Marketing researchers often use city blocks as clusters in cluster sampling. Using this fact, explain how a market researcher might use multistage cluster sampling to select a sample of consumers from all cities having a population of more than 10,000 in a large state having many such cities.