Repeated measures design is also known as which term?

• A. Between-Subjects Design
• B. Matched Pairs Design
• C. Within-Subjects Design
• D. Crossover Design

Answer: (C)

Repeated measures design involves measuring the same participants under all experimental conditions, so each person acts as their own control. This approach reduces variability due to differences between individuals and often increases statistical power, letting you detect effects with fewer participants. The term that best captures this setup is within-subjects design. Using different people for each condition (between-subjects) introduces more between-person variability and weakens direct comparisons. A matched-pairs design uses pairs of similar participants but still assigns each person to only one condition, so it isn’t truly repeated measures. A crossover design is a specific way to implement repeated measures by sequencing treatments for the same participants, but the general, widely used label for repeated measures is within-subjects design.