The diagram describes a study of three treatments stratified by age.
What design is shown?
- Acheck_circle
Randomized block design with two blocks and three treatments
- B
Matched-pairs design
- C
Stratified sampling design
- D
Completely randomized design with six treatments
Explanation
Subjects are first separated into blocks (Young/Old), then randomly assigned to one of three treatments within each block. This is a randomized block design.