A researcher designs an experiment by manipulating 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 would the researcher require in order to have 10 participants per condition?
A)20
B)150
C)10
D)100

Question

Quizplus · Accepted Answer

For a completely repeated measures design, each participant would be exposed to all four conditions (low temperature/low illumination/daytime, high temperature/low illumination/daytime, low temperature/high illumination/daytime, high temperature/high illumination/daytime, low temperature/low illumination/nighttime, high temperature/low illumination/nighttime, low temperature/high illumination/nighttime, and high temperature/high illumination/nighttime). Therefore, the number of participants needed for 10 participants per condition would be (10 participants per condition) x (8 total conditions) = 80 participants.

A Researcher Designs an Experiment by Manipulating the Following Variables