The most important reason for choosing an ex post facto design rather than an experimental design is when
A) random sampling is not possible.
B) random assignment must be used.
C) manipulation of the independent variable is not possible.
D) intact classroom groups must be used.
E) young children are the subjects in the research.

Question

Quizplus · Accepted Answer

Ex post facto designs are used when the independent variable cannot be manipulated, which may occur in situations such as studying the effects of a natural disaster or a historical event. Experimental designs, on the other hand, require manipulation of the independent variable to determine cause-and-effect relationships. Therefore, choice C is the most appropriate option.

The Most Important Reason for Choosing an Ex Post Facto