Psychology Component 2: Experiments

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4 Terms

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Null Hypothesis

A hypothesis that suggests there will be no difference/relationship between variables, any that does occur does do by chance. e.g: alcohol will have no effect on reaction time.

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Directional Hypothesis

A hypothesis that suggests there will be a difference/relationship between variables, where the IV will affect the DV in one specific direction/outcome

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Extraneous Variables

Variables in a study that are not being measured of manipulated by the researcher but affect the results (DV) of ALL participants’ behaviour equally.

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Non-Directional Hypothesis

A hypothesis that suggests there will be a difference/relationship between variables, the IV will affect the DV but does not state a specific direction/outcome for results.