To compare two brands of running shoes, 20 runners each run two trials: one with Brand A on the left foot and Brand B on the right, the other with the brands reversed. The order of trials and which foot wears which brand is randomized for each runner.
This study uses which design?
- A
Completely randomized design
- Bcheck_circle
Matched-pairs design
- C
Stratified design
- D
Cluster design
Explanation
Each runner serves as their own block, receiving both treatments with order randomized. This is the classic matched-pairs design.