If there are two groups at issue, an experimental and a control group, and the experimenter considers two test units as a pair by means of some external criterion before assigning one unit randomly from each pair to each group, he is said to be using

Question

Quizplus · Accepted Answer

This describes the process of matching, where two units are paired based on certain criteria before one is randomly assigned to the experimental group and the other to the control group. This method is used to ensure that the two groups are as similar as possible, except for the treatment applied to the experimental group.

If There Are Two Groups at Issue, an Experimental and a Control