A researcher designs an experiment by manipulating the following variables: method of presenting material (visual, auditory); difficulty level (easy, difficult); and amount of material (low, moderate, high). For a completely independent groups design with 10 participants per group, how many participants would the researcher need?
A)80
B)120
C)70
D)60

Question

Quizplus · Accepted Answer

The researcher wants to manipulate three independent variables, resulting in 2x2x3 = 12 experimental conditions. With 10 participants per group, the researcher would need a total of 120 participants (10 participants per group x 12 groups). Therefore, the best choice is option B.

A Researcher Designs an Experiment by Manipulating the Following Variables