The random assignment of individuals to test and control groups is important because this procedure ________.
A)eliminates the possibility of problems associated with data collection
B)guarantees the same number of men and women in each group
C)reduces many of the threats to external validity
D)reduces many of the threats to internal validity

Question

Quizplus · Accepted Answer

Random assignment to test and control groups is important because it reduces many of the threats to internal validity, such as selection bias and confounding variables. It helps to ensure that differences between the groups are due to the treatment being tested, rather than other factors.

The Random Assignment of Individuals to Test and Control Groups