For an experiment that compares two treatment conditions with ten scores in each treatment,which design would require the smallest number of participants?
A)between participants
B)within participants
C)matched subjects
D)all designs would require the same number of participants

Question

For an experiment that compares two treatment conditions with ten scores in each treatment,which design would require the smallest number of participants?
A)​between participants
B)​within participants
C)matched subjects
D)​all designs would require the same number of participants

Quizplus · Accepted Answer

Within participants design requires the smallest number of participants since each participant is exposed to both treatment conditions. Therefore, the sample size is effectively halved as compared to other designs where separate groups of participants are needed for each condition.

For an Experiment That Compares Two Treatment Conditions with Ten