Suppose state lawmakers are interested in finding out whether a newly instituted elementary school program about bullying is effective. A statistician divides the state into three regions then randomly selects a sample of thirty elementary schools from each region. Students at the selected schools complete a questionnaire about bullying. What kind of sampling does this illustrate?
A)Random Sampling
B)Cluster
C)Systematic
D)Stratified

Question

Quizplus · Accepted Answer

This is an example of stratified sampling because the state is divided into regions (strata), and then a random sample of schools is taken from each region.

Suppose State Lawmakers Are Interested in Finding Out Whether a Newly