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There are many situations where a researcher cannot actively manipulate an independent variable for practical or ethical reasons, making a true experiment impossible. For example, a researcher cannot ethically manipulate whether individuals suffer a significant early illness to study its effect on hypochondriasis. When active manipulation is not possible, researchers must investigate the relationship using nonexperimental approaches.

Inability to Manipulate Variables

A researcher plans to investigate a cause-and-effect relationship by using a study design that requires them to create different groups by directly assigning participants to possess a certain characteristic or experience a specific condition. Which of the following research questions would be impossible to investigate using this specific type of design?

Quasi-experimental research is a methodological design that incorporates some, but not all, of the essential features of a true experiment. While researchers using this approach may introduce a treatment or comparison condition, they frequently fail to use random assignment to place participants into distinct groups or omit counterbalancing to control for potential order effects. Consequently, while it offers more control than purely correlational studies, quasi-experimental research generally possesses lower internal validity than true experimental research.

Quasi-Experimental Research

What is the primary reason a researcher might be forced to investigate a psychological relationship using nonexperimental approaches rather than a true experiment?

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