Even though it is not always possible to employ random selection, random assignment should be used whenever possible.

Question

Quizplus · Accepted Answer

Random assignment helps to eliminate selection bias and increase the likelihood that the groups being compared differ only in the treatment being studied. Random selection is not always possible or appropriate, but random assignment should still be used whenever possible in order to ensure that the experimental and control groups are as equivalent as possible at the beginning of the study.

Even Though It Is Not Always Possible to Employ Random