A researcher is conducting a study in which the same group of individuals participates in a series of treatment conditions that are administered over several weeks.A flu outbreak that occurs in the middle of the study would be an example of a history effect.

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A history effect refers to any external event that occurs during the course of a study and affects the results, such as a natural disaster or political event. The flu outbreak would be an example of a history effect because it is an external event that could potentially impact the participants' responses to the treatments.

A Researcher Is Conducting a Study in Which the Same