To Study Math Achievement in West Virginia's Third Graders, a Researcher

Multiple Choice

To study math achievement in West Virginia's third graders, a researcher randomly selects 5% of the state's school districts and gives all the students in each district a math test. What sampling procedure is being used here?

A) quota
B) stratified
C) cluster
D) none of the above (all the children in the selected districts are tested - therefore the entire population is being tested, not just a sample)