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A method where whole groups are chosen at random and everyone in them is studied is:

AClearing sampling
BCluster sampling
CCluttered sampling
DClustered lending
Answer & Solution
Correct answer: B. Cluster sampling
1. Groups, not individuals, are drawn. 2. Everyone inside a chosen group takes part. 3. It is cluster sampling. _Source: OpenStax Introductory Business Statistics 2e, Chapter 1, Sampling and Data._
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