For each of the following scenarios, identify which sampling method is used (see textbook for names) A. The city population consists of four major ethnic groups that are not equally represented in the population. To ensure that the sample reflects these differences, the researcher first determines the number of residents in each ethnic group and then selects a sample so that the number for each group in the sample is in direct relation to the number in each group for the entire city population. B. The County Democratic Committee would like to determine which issues are most important to registered Democrats in the county. Starting with a list of registered Democrats, the committee uses a random process to select a sample of 30 names for telephone interviews. C. A medical research laboratory places ads in the local newspaper to recruit people with chronic migraine headaches to participate in clinical trials evaluating a new medication. Qualified individuals are asked to phone the lab for a screening appointment.
- For each of the following scenarios, identify which sampling method is used (see textbook for names)
A. The city population consists of four major ethnic groups that are not equally represented in the population. To ensure that the sample reflects these differences, the researcher first determines the number of residents in each ethnic group and then selects a sample so that the number for each group in the sample is in direct relation to the number in each group for the entire city population.
B. The County Democratic Committee would like to determine which issues are most important to registered Democrats in the county. Starting with a list of registered Democrats, the committee uses a random process to select a sample of 30 names for telephone interviews.
C. A medical research laboratory places ads in the local newspaper to recruit people with chronic migraine headaches to participate in clinical trials evaluating a new medication. Qualified individuals are asked to phone the lab for a screening appointment.
D. A researcher conducting a political poll for a statewide election would like to know the attitudes of college students concerning the candidates. A group of 200 upperclassman from the state university is selected to participate in the study.
-What is the population in this example?
-What is the sample in this example?
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