In the above study, suppose that 10 subjects are tested in condition represented by the upper left hand cell of the factorial matrix. How many subjects need to be recruited to complete the study?
A)30
B)60
C)20
D)10

Question

Quizplus · Accepted Answer

There are 4 conditions in the factorial matrix, and each condition requires 10 subjects. So, the total number of subjects needed is 4 x 10 = 40. Since 10 subjects have already been tested, 40 - 10 = 30 more subjects need to be recruited.

In the Above Study, Suppose That 10 Subjects Are Tested