PSYB04H3 Lecture Notes - Lecture 8: Blind Experiment, Demand Characteristics, Observer-Expectancy Effect

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Degree to which we can conclude that the changes in the iv caused the changes in the dv; good to have high internal validity because it means you"re very sure about the link. Any factor in the study that allows an alternative explanation for the results is a threat to internal validity. Most studies have constraints because you can only have so many participants or only one location, short period of time. Real life situations high external validity, hard to rule out other explanations because you can"t control the types of people and ensuring that the behaviour is consistent. Lab settings high internal validity, often arti cial and ndings can"t be generalized. Tradeo if you increase internal, external decreases, and vice versa. Conduct both lab and eld experiments that study the same phenomena to deal with this. Appears that the iv isn"t making any di erence.

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