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Clinical Trial
A research design that tests the effects of medical treatment. Many clinical trials are randomized controlled trials that allow researchers to determine whether a new treatment is or is not effective.
Ex Post Facto Study
A research design that examines the effects of an independent variable on a dependent variable, where the study is conducted after the events have occurred.
Independent Variable
In research, a variable that is manipulated or changed to observe its effect on a dependent variable.
Longitudinal Studies
Research design that involves repeated observations of the same variables over short or long periods of time.
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