Random assignment is essential to establishing causality because it
A) permits researchers to verify that they have a diverse and representative sample of participants.
B) reduces the possibility that individual characteristics of the participants produced the observed results.
C) increases the external validity of the experiment and virtually eliminates issues of reliability.
D) allows researchers to determine whether or not their operational definitions reflect the variables of interest.

Question

Quizplus · Accepted Answer

Random assignment reduces the likelihood that differences among participants are responsible for the observed effects, thereby helping to establish a cause-and-effect relationship between variables.

Random Assignment Is Essential to Establishing Causality Because It