A statewide sample survey is to be conducted. First,the state is subdivided into counties. Seven counties are selected at random,and further sampling is concentrated on these seven counties. What type of sampling is this?
A)Simple random
B)Systematic random sampling
C)Cluster sampling
D)Stratified sampling

Question

Quizplus · Accepted Answer

This is an example of cluster sampling because the state is subdivided into counties and then sampling is concentrated on these counties. The initial selection of the counties was done randomly, but the focus is on the clusters (counties) rather than individual units within each cluster.

A Statewide Sample Survey Is to Be Conducted