In an experiment, participants are usually assigned to treatments using random assignment. The reason for using random assignment is ____.
A) to allow the experimenter to manipulate participant variables
B) to allow the experimenter to manipulate environmental variables
C) to help control extraneous variables
D) to increase the reliability of the outcome measures

Question

Quizplus · Accepted Answer

Random assignment helps control for extraneous variables by ensuring that participants are randomly assigned to the different treatment groups. This reduces the likelihood that any preexisting differences between participants will influence the results of the study. Random assignment does not typically involve manipulating participant or environmental variables, nor does it directly affect the reliability of the outcome measures.

In an Experiment, Participants Are Usually Assigned to Treatments Using