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Dr. Green is interested in conducting a 2 x 2 x 3 within-group factorial design, with...

Dr. Green is interested in conducting a 2 x 2 x 3 within-group factorial design, with 20 participants in each cell. How many participants does she need overall?

please explain why

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Answer #1

A within subject design is where the same set of participants are exposed to esch condition in the experiment.

So in a 2×2×3 factorial design, there are 12 test conditions, had it been between subject design, each of these 12 conditions would require a different set of 20 subjects like around 240 participants.

However for a within subject design, the same 20 participants will be present in all the conditions, so the total number of participants required will be just 20.

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