The reason that researchers cannot allow participants to decide whether to be in the control or treatment group is that this procedure may result in differences between the treatment and control group participants that
A) have nothing to do with the independent variable.
B) are a direct result of the independent variable.
C) have nothing to do with the dependent variable.
D) are a direct result of the dependent variable.

Question

Quizplus · Accepted Answer

Allowing participants to decide which group they will be in could result in differences between the groups that have nothing to do with the independent variable being tested. This could compromise the internal validity of the study, making it difficult to determine if any differences observed between the groups are due to the independent variable or other factors. Therefore, researchers need to carefully assign participants to treatment and control groups to minimize these differences.

The Reason That Researchers Cannot Allow Participants to Decide Whether