Two Matched Groups Matching procedures are especially useful when we have small numbers of subjects because
A)matching increases the external validity of our experiment.
B)matching produces a normal distribution of scores.
C)random assignment can only be used when there are 20 subjects per group.
D)random assignment may not produce similar groups.

Question

Quizplus · Accepted Answer

Matching procedures help to ensure that the groups in an experiment are similar on important variables that could potentially affect the outcome of the study. Random assignment does not guarantee that the groups will be similar, especially in small sample sizes. Matching can therefore increase the internal validity of the study by reducing the likelihood of confounding variables. However, matching does not necessarily increase the external validity of an experiment, nor does it produce a normal distribution of scores. Random assignment can still be used in small sample sizes, but it may not be as effective in creating similar groups as matching procedures.

Two Matched Groups Matching Procedures Are Especially Useful When We