A researcher investigates how political attitudes (Republican, Democrat) are related to attitudes toward teaching evolution in a school classroom. To select the sample, she is given access to a database identifying the political affiliations and mailing addresses for all local residents in her area. She splits the list into two subgroups (Republican, Democrat), and then selects a sample or portion of individuals from each subgroup. To select participants from each subgroup, she uses a random procedure to select the first address and then selects every sixth address after that until 300 participants from each subgroup are selected. What three sampling methods has she combined to select this sample?
What will be an ideal response?
Ans: Convenience sampling (only local residents have a chance of being selected), simple stratified random sampling (the list is separated into subgroups, and an equal number of participants are selected from each subgroup), and systematic sampling (she chooses every sixth address on the list after a random start) Learning Objective: 6-5: Delineate four probability sampling methods: simple random sampling, stratified random sampling, systematic sampling, and cluster sampling. Cognitive Domain: Application
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