You design an experiment that manipulates the following variables: temperature (low or high);illumination level (low or high);and time of testing (day or night).For a completely repeated measures design,how many participants will you need to have 10 participants per condition?
A) 20
B) 150
C) 10
D) 100

Question

Quizplus · Accepted Answer

With a completely repeated measures design, each participant experiences all of the conditions, which means we only need 10 participants to have 10 participants per condition (i.e., 2 conditions x 2 levels x 10 participants = 40 total participants needed). Therefore, option C, 10 participants is the correct answer. Option A and D are incorrect because they are too high, and Option B is incorrect because it suggests an independent groups design rather than a repeated measures design.

You Design an Experiment That Manipulates the Following Variables: Temperature