Subjects are said to be assigned randomly when
A) they are selected to participate in an experiment from a sample which is representative of the larger population.
B) they each have an equal chance of being assigned to either the experimental or control group.
C) they are assigned to experimental and control groups so that the groups differ on some critical variable before the experiment begins.
D) neither the experimenter nor the subject knows whether the subject is in the experimental or control group.

Question

Quizplus · Accepted Answer

When subjects are assigned randomly, they each have an equal chance of being assigned to either the experimental or control group, which helps to ensure that the two groups are comparable and any observed differences between the groups are due to the experimental manipulation rather than preexisting differences between the groups.

Subjects Are Said to Be Assigned Randomly When