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History
- Events that occur during the course of the experiment, other than the manipulated independent variable, that occur during the course of the experiment and that may affect the outcome
- An example would be historical events that had a major impact in the participant’s environment like a terrorist attack
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Maturation
- Psychological or physical changes taking place within subjects that occur with the passing of time regardless of the experimental manipulation.Â
- Subjects may become hungry throughout participating in the study which can result in fatigue
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Attrition
The loss of subjects
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