Random assignment of participants to the various groups in an experiment
A) guarantees that the independent variable will affect the dependent variable.
B) maximized the probability that extraneous variables will NOT have a differential effect on the various treatment groups.
C) is essential if you want to generalize your results to the population.
D) is very difficult to do and is therefore not commonly done.

Question

Quizplus · Accepted Answer

Random assignment maximizes the probability that extraneous variables will not have a differential effect on the various treatment groups by ensuring that each participant has an equal chance of being assigned to any group, thus balancing out unknown factors across groups.

Random Assignment of Participants to the Various Groups in an Experiment