The technique of matching to control for confounding in an experiment results in ____.
A)all groups having similar variability
B)holding variability constant across groups
C)placing individuals with comparable values on the confounding variable in all experimental groups
D)none of these

Question

Quizplus · Accepted Answer

Matching individuals with comparable values on the confounding variable in all experimental groups helps to ensure that any observed treatment effects are not the result of differences in the confounding variable across groups. This helps to control for confounding and increase the internal validity of the experiment. Option A and B are not necessarily true outcomes of matching, and option D is incorrect because matching is a technique used for controlling confounding.

The Technique of Matching to Control for Confounding in an Experiment