A researcher randomly selects ten drug treatment centers in the state and then randomly selects twenty patients at each of the drug treatment centers to survey. This probability sampling technique is best defined as:

Question

Quizplus · Accepted Answer

This is an example of cluster sampling because the researcher is selecting entire treatment centers (clusters) instead of individual patients, and then sampling all patients within each selected center.

A Researcher Randomly Selects Ten Drug Treatment Centers in the State