The textbook describes a study in which researchers tracked 144 people with obsessive-compulsive disorder for more than 40 years. Recall the research designs used in developmental psychology. Skoog and Skoog's study exemplifies _____ research.

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The study tracked the same individuals over a period of 40 years, which is characteristic of a longitudinal research design. Correlational research looks at the relationship between two or more variables and does not involve tracking individuals over time. Cross-sectional research compares individuals of different ages at one point in time. Experimental research involves manipulating one variable to see its effect on another variable. None of these research designs fit the Skoog and Skoog study as well as longitudinal.

The Textbook Describes a Study in Which Researchers Tracked 144