In doing a survey of Chicago residents' evaluation of their schools, the researcher divides the city into 9 square-block areas and randomly selects 20 areas for study. This is an example of
A) stratified random sampling.
B) cluster sampling.
C) subgroup analysis.
D) use of a large sample.

Question

Quizplus · Accepted Answer

This is an example of cluster sampling because the researcher divides the population into clusters (in this case, 9 square-block areas) and then randomly selects some of these clusters (20 areas) to study. This approach is used to simplify the sampling process and is especially useful when the population is geographically dispersed.

In Doing a Survey of Chicago Residents' Evaluation of Their