Experimental Research Independent variable Dependent variable Causation.

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Presentation transcript:

Experimental Research Independent variable Dependent variable Causation

CHAPTER 7 Experimental Research

Establishing causation Universal laws Statistical laws

Requirements for causal relationship IV must precede the DV IV and DV must covary Changes in DV must be result of changes in the IV

Control – a researcher attempts to exclude other possible causes of the effect he/she is studying

Exposing participants to the IV Conditions Treatment Attribute variables

Selection equivalence

Random assignment increases the internal validity of a study while random sampling increases external validity of a study

Controlling for the effects of extraneous influences Threshold effects Experimenter effects Other effects

Experimental Research Designs Full experiment Quasi-experiment Preexepriment

Factorial design Studies with more that 1 IV are summarized with a design statement Example a 2 x2 design

Between-group design Within-group design

Lab versus field experiments

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