Examlex
If fossils of marine organisms are found in Himalayan sedimentary rock toward its summit, that is an indicator that this region was once an ocean.
Correlational Study
A research method that examines the relationship between two or more variables to determine if a change in one is associated with a change in others.
Retrospective Study
A research design that looks back in time to analyze data from past records to investigate a particular outcome or phenomenon.
Prospective Study
A research design that follows participants forward in time to examine the relationship between specific exposures and outcomes.
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.
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