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Correlation is classified as a nonexperimental, descriptive method. The reason for that is because variables are not directly manipulated as they are in the experimental method.
Although correlation is often described as a method of research in its own right, it is really more of a mathematical technique for summarizing data, it is a statistical tool.
A correlational study is one designed to determine the degree and direction of relationship between two or more variables or measures of behavior.
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