Experimenters use random assignment of participants to different groups in order to:
A) increase the likelihood that the participants in each group know one another.
B) increase the likelihood that participants within a group are similar to one another.
C) reduce the likelihood of any preexisting differences between groups.
D) ensure that each group has the same number of participants.

Question

Quizplus · Accepted Answer

Random assignment is used to minimize preexisting differences between the various groups, ensuring that any observed effects can be attributed more confidently to the experimental manipulations rather than to these differences.

Experimenters Use Random Assignment of Participants to Different Groups in Order