One difference between a repeated-measures design and a matched-samples design is that
A) only one design is a type of related-samples design.
B) only one design increases the power to observe an effect.
C) only one design involves observing the same participants in each group.
D) only one design eliminates between-persons variability.

Question

Quizplus · Accepted Answer

The key difference between a repeated-measures design and a matched-samples design is that a repeated-measures design involves observing the same participants in each group, whereas a matched-samples design involves matching participants on relevant variables (such as age, gender, or IQ) and then randomly assigning them to different groups. Both designs are types of related-samples designs and can increase power by reducing error variance. However, only a matched-samples design eliminates between-persons variability, as participants in each group are matched on relevant variables, whereas participants in a repeated-measures design may differ on these variables.

One Difference Between a Repeated-Measures Design and a Matched-Samples Design