A school district has 80 elementary school classrooms, each containing about 25 students. Researchers want to estimate the proportion of students who eat breakfast at home. They randomly select 8 of the 80 classrooms and survey every student in those chosen classrooms.
Which sampling method is being used?
- Acheck_circle
Cluster sample
- B
Systematic sample
- C
Simple random sample
- D
Stratified random sample
Explanation
Classrooms (clusters) are randomly selected, and every student within the chosen clusters is surveyed. This is a cluster sample, distinguished from stratified sampling by sampling whole groups rather than within groups.