The inclusion of a control group
A)always makes a study internally valid.
B)is part of the criteria for a design to be considered an experiment.
C)can never be done ethically when examining the effectiveness of therapy.
D)all of the above.

Question

Quizplus · Accepted Answer

Including a control group is part of the criteria for a design to be considered an experiment. It helps to ensure that any changes observed in the group receiving the treatment are actually due to the treatment and not other factors such as chance or history. While there may be ethical concerns when examining the effectiveness of therapy, it is still possible to include a control group with appropriate ethical considerations.

The Inclusion of a Control Group