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

Question

Quizplus · Accepted Answer

To calculate the number of participants needed for a completely independent group design, you multiply the number of levels of each variable. In this case, there are 2 levels for the method of presenting material (visual, auditory), 2 levels for the difficulty of material (easy, difficult), and 3 levels for the amount of material (low, moderate, high), giving us a total of 2x2x3 = 12 conditions. Since we want 10 participants per group, we need a total of 120 participants (12 x 10). Therefore, the best choice is option B.

You Design an Experiment That Manipulates the Following Variables: Method