Child Psych

Category - Research & Stats

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What does cluster sampling refer to, in the context of increasing the external validity of a study?

It ensures proportional representation.
The sampling unit is a naturally occurring group.
It ensures a sample representative of the population.
Subjects do not know which group they are in.

Explanation

Answer: B - Cluster sampling uses a naturally-occurring group as a study group. Using a group of coffee drinkers and a group of tea drinkers in a study is cluster sampling; this approach is often used in marketing research.

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