Matching subjects in the experimental and control groups is useful when
A) small samples are to be used.
B) large differences between the groups on the dependent variable are likely.
C) random assignment to groups is not possible.
D) All of these are true.
E) a and c

Question

Quizplus · Accepted Answer

Matching subjects in the experimental and control groups is useful when random assignment to groups is not possible, as in the case of pre-existing conditions or characteristics that may affect the dependent variable. It is also useful when small samples are to be used to increase the comparability of the groups, but it may not be necessary when large samples are available. Matching is not necessary when large differences between the groups on the dependent variable are likely, as it may limit the variability and generalizability of the findings. Therefore, the best choice is E, as it includes the most accurate statements about the use and limitations of matching in experimental design.

Matching Subjects in the Experimental and Control Groups Is Useful