A statewide sample survey is to be made. 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, where the population is divided into clusters and a random sample of clusters is selected. In this case, the counties are the clusters and a sample of seven counties is selected at random. Then, further sampling is done within these seven counties.

A Statewide Sample Survey Is to Be Made