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

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.

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.

Experimenter Bias

* Lower external validity
* Ethical concerns
* Experimenter bias

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Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

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