Chapter 9 Fundamentals of Research. Experimental Research A deliberate manipulation of a variable to see if corresponding changes in behavior result,

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Presentation transcript:

Chapter 9 Fundamentals of Research

Experimental Research A deliberate manipulation of a variable to see if corresponding changes in behavior result, allowing the determination of cause-and-effect relationships Example Hypothesis: Violent TV Programs cause Children to be More Aggressive

The Experiment: Variables Independent Variable=manipulated Dependent Variable=measured What is the IV (& DV)?  Light or No Light  Plant Growth What is the IV (& DV)?  Aggression  Violent TV Or No Violent tv

Levels of Measurement

The Experiment: Groups Experimental Group=Treatment Control Group=no treatment Which Group should watch violent tv?  Experimental  Control Experimental GroupControl Group

The Importance of Randomization  Random Assignment

Experimental Hazards  Placebo Effect -Single/Double Blind Procedure  Experimenter Effect  Hawthorne effect

Confounding & Extraneous Variables

Evaluating Results  Significant Outcome

External & Internal Validity Pair Share: Explain the relationship between internal validity & extraneous variables.

Post-Facto Research Study Time Exam Scores Party Time Measuring the relationships between 2 variables

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