Data, Sampling, and Variation in Data and Sampling · Exercise 7
For the following four exercises, determine the type of sampling used (simple random, stratified, systematic, cluster, or convenience).
A group of test subjects is divided into twelve groups; then four of the groups are chosen at random.
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OpenStax, Introductory Statistics 2e · §1.2 Data, Sampling, and Variation in Data and Sampling · Exercise 7
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