In psychology, there are 3 main types of research. These are typically categorized as:
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Descriptive Research: This includes case studies, surveys, and observational studies that help to describe characteristics of a population or phenomenon.
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Correlational Research: This examines the relationships between two or more variables to determine if they are associated in some way.
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Experimental Research: This involves manipulating one variable to determine its effect on another variable, typically through controlled experiments.
So the answer is 3.