Often, we do not know at the start of an experiment what extraneous variables could affect our results. The best means of controlling unknown sources of extraneous variables is
A) matching.
B) counterbalancing.
C) randomization.
D) analysis of covariance.

Question

Quizplus · Accepted Answer

Randomization is the best method for controlling unknown sources of extraneous variables because it ensures that each participant has an equal chance of being assigned to any group, thus averaging out unknown variables across groups.

Often, We Do Not Know at the Start of an Experiment