Which type of study is considered strongest for testing the effectiveness of an intervention?
A) Experimental
B) Pretest/Posttest
C) Quasi-experimental
D) Randomized controlled trial

Question

Quizplus · Accepted Answer

Randomized controlled trials are considered the strongest type of study for testing the effectiveness of an intervention because they involve random assignment of participants to either the intervention group or a control group, which helps control for confounding variables and reduces the risk of bias. Other types of studies, such as experimental, pretest/posttest, or quasi-experimental designs, may not involve randomization or control groups and may have limitations in terms of internal validity.

Which Type of Study Is Considered Strongest for Testing the Effectiveness