In an experiment, participants are randomly assigned to treatment conditions ____.
A) to help protect the internal validity of the study
B) to help protect the external validity of the study
C) to help protect both the internal and external validity
D) as an alternative to manipulation of variables

Question

Quizplus · Accepted Answer

Randomly assigning participants to treatment conditions helps protect the internal validity of the study because it ensures that any differences between groups are due to the treatment and not other extraneous variables. While it may also have some impact on external validity, its primary purpose is to ensure the accuracy and validity of the study's results.

In an Experiment, Participants Are Randomly Assigned to Treatment Conditions