Divides population into clusters; randomly selects entire clusters Clusters (often heterogeneous) are sampled as wholes; useful when cost dominates.

Divides population into clusters; randomly selects entire clusters

Random Sampling and Data Collection

AP Statistics· difficulty 3/5

Cluster sampling

A
$SRSs every individual$
B
$Same as stratified$
C
$Divides population into clusters; randomly selects entire clusters$
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D
$Surveys only volunteers$

Explanation

Clusters (often heterogeneous) are sampled as wholes; useful when cost dominates.

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