Which of the following is not true about cluster sampling?

Cluster sampling can save time and money because researchers collect data from selected groups rather than sampling individuals across the whole population. However, people within a cluster may be similar to one another, so cluster sampling often increases sampling variability compared with a simple random sample of the same size. Therefore, the statement that it reduces sampling variability is not true; the correct choice is B, “Cluster sampling has the advantage of reducing sampling variability.”

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