Based on the following research scenario, analyze the design and identify the most significant potential weakness that could challenge the validity of the psychologist's conclusion. Explain your reasoning.

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* Lower external validity
* Ethical concerns
* Experimenter bias

Experimental Research Weakness

Participant expectancy effects are changes in a participant's behavior or responses that are caused by their own beliefs about the research, rather than the experimental manipulation itself. A key feature of a strong experimental design is the inclusion of controls to limit these effects, ensuring that the outcomes are a true reflection of the independent variable's impact.

Participant Expectancy Effects

Evaluating a Research Design

Experimenter bias refers to the possibility that a researcher's expectations or vested interests in a study's outcome might unintentionally skew or influence the results.

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