In matched pairs design, what is a key feature of allocation?

In matched pairs design, what is a key feature of allocation?

• A. One participant in each matched pair is assigned to the control condition and the other to the experimental condition.
• B. Participants are matched on key characteristics and then randomly assigned to conditions.
• C. Each participant experiences both conditions.
• D. There is no need to match participants.

Answer: (A)

Allocation in matched pairs means that one member of each pair is placed into the experimental condition and the other member into the control condition. Pairing participants on relevant characteristics (like age, baseline score, or other factors) makes the two groups as similar as possible before the treatment is applied, so differences observed after the manipulation are more likely due to the manipulation itself rather than pre-existing differences. This setup reduces between-subject variability and boosts the study’s sensitivity to detect effects. In practice, which member of each pair goes to which condition is decided randomly, to avoid systematic bias. This differs from designs where each participant experiences both conditions, or where participants aren’t matched at all.

Allocation in matched pairs means that one member of each pair is placed into the experimental condition and the other member into the control condition. Pairing participants on relevant characteristics (like age, baseline score, or other factors) makes the two groups as similar as possible before the treatment is applied, so differences observed after the manipulation are more likely due to the manipulation itself rather than pre-existing differences. This setup reduces between-subject variability and boosts the study’s sensitivity to detect effects. In practice, which member of each pair goes to which condition is decided randomly, to avoid systematic bias. This differs from designs where each participant experiences both conditions, or where participants aren’t matched at all.