How many total subjects are needed in a 2 x 2 mixed-model group design with 20 subjects in each treatment group?
A) 10
B) 20
C) 40
D) 80

Question

Quizplus · Accepted Answer

In a 2 x 2 mixed-model group design, there are two between-subjects factors and two within-subjects factors. With 20 subjects in each treatment group, the total number of subjects needed would be:

Total subjects = number of subjects per treatment group x number of treatment groups
Total subjects = 20 x 2
Total subjects = 40

How Many Total Subjects Are Needed in a 2 X