A true experiment allows the establishment of nonspuriousness through:
A) Using two comparison groups
B) Controlling when treatment occurs
C) Random assignment into two or more comparison groups
D) Documenting the conditions under which change occurs
E) All of the above

Question

Quizplus · Accepted Answer

Random assignment into two or more comparison groups is the only method that can establish nonspuriousness and eliminate the possibility of a third variable causing the observed relationship between the independent and dependent variables. The other options may help to control for certain variables, but they do not provide the same level of control as random assignment.

A True Experiment Allows the Establishment of Nonspuriousness Through