Matching subjects on control variables in an experiment
A) is just as effective in controlling for extraneous variables as is random assignment.
B) is easier to implement than random assignment.
C) may be used in conjunction with random assignment.
D) is intended to increase an experiment's external validity.

Question

Quizplus · Accepted Answer

Matching subjects on control variables can be used alongside random assignment to ensure that groups are equivalent on certain variables, enhancing the internal validity of the experiment.

Matching Subjects on Control Variables in an Experiment