What is best way to ensure similarity between groups in an experiment?
A) Random assignment.
B) Pretest.
C) Questionnaire.
D) Gut feeling.

Question

Quizplus · Accepted Answer

Random assignment is the best way to ensure similarity between groups in an experiment. It involves assigning participants to different groups by chance, which minimizes the potential for bias and ensures that groups are similar in terms of demographic characteristics and other relevant variables. Pretests and questionnaires can also be useful in assessing baseline differences between groups, but they alone do not ensure similarity. Gut feeling is not a reliable method for ensuring similarity between groups in an experiment.

What Is Best Way to Ensure Similarity Between Groups in an Experiment