A researcher is studying an old edition of an encyclopedia. She wishes to estima

Question

A researcher is studying an old edition of an encyclopedia. She wishes to estimate the proportion of the printed matter in the encyclopedia that is diagrams and pictures (as opposed to text). The encyclopedia consists of 30 volumes, and she observes that the proportion of printed matter that is diagrams and pictures is roughly the same in each of the volumes. The researcher randomly selects four of the volumes, and then studies every page in those four volumes. This is an example of which type of sampling? (A) Cluster (B) Convenience (C) Simple random (D) Stratified random (E) Systematic

Explanation / Answer

The answer is cluster sampling. In the cluster sampling sample is created out of the random selection of elements of all the streta. Hence above scenario we used cluster sampling

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