An important reason for using random assignment in a study with independent groups is to
A) prevent any systematic differences between groups on extraneous variables.
B) be able to generalize to broader populations.
C) rule out competing interpretations of any differences we find.
D) a and c

Question

Quizplus · Accepted Answer

Random assignment helps to ensure that any systematic differences between groups on extraneous variables are not driving the results, and it also helps to rule out competing interpretations of any differences we find. Random assignment does not necessarily help with generalizability to broader populations.

An Important Reason for Using Random Assignment in a Study