Experiment - an investigation looking for a causal relationship in which an independent variable is manipulated and is expected to be responsible for changes in the dependent variable., Independent Variable - the factor under investigation in an experiment which is manipulated to create two or more conditions – levels -and is expected to be responsible for changes in a variable., Dependent Variable - the factor in an experiment which is measured and is expected to change under the influence of a variable., Extraneous Variable - a variable which either acts randomly, affecting the DV in all levels of the IV or systematically., Experimental Conditions - one or more of the situations in an experiment which represent different levels of the IV and are compared - or compared to a control condition., Control Condition - a level of the IV in an experiment from which the IV is absent., Experimental Design - the way in which participants are allocated to levels of the IV, Independent Measures - an experimental design in which a different group of participants is used for each level of the IV – condition., Repeated Measures - an experimental design in which each participant performs in every level of the IV, Matched Pairs - an experimental design in which participants are arranged into pairs. Each pair is similar in ways that are important to the study and one member of each pair performs in a different level of the IV.,

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