Subjects are randomly assigned to experimental and control groups to:
A) make the two groups as similar as possible in all major characteristics.
B) eliminate the placebo effect.
C) establish possible correlations between the independent and dependent variables.
D) eliminate experimenter effects.

Question

Quizplus · Accepted Answer

Randomly assigning subjects to groups helps to ensure that there are no systematic differences between the groups at the start of the experiment, making them similar in all major characteristics. This is important for drawing valid causal inferences from the study results.

Subjects Are Randomly Assigned to Experimental and Control Groups To