Chapter 8part1 notes

Chapter 8part1 notes - Chapter 8 Basic Issues in...

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Unformatted text preview: Chapter 8 Basic Issues in Experimental Research Experimental Research • Descriptive research allows us to describe thoughts, people, emotions, ect. • Correlational research allows us to determine if variables are related • But they do not allow us to test directly hypotheses about the causes of behavior • Experiments: allow us to draw conclusions about cause-and-effect relationships Experimental Research • Three essential properties of a well- designed experiment: 1) Vary at least one independent variable (IV) to assess it’s effect on the participants’ behavior 2) Be able to assign participants to the various experimental conditions in a way that assures their initial equivalence 3) Control the extraneous variables that may influence participants’ behavior The Independent Variable • By observing how behavior varies with changes in the conditions controlled by the experimenter, we can then determine whether those variables affect behavior • In every experiment the researcher varies one or more independent variables The Independent Variable (cont’d) • IV’s must have two or more levels or conditions (levels) • Differences in levels can be quantitative (number) or qualitative (type) Types of Independent Variables • Environmental manipulations • Instructional manipulations • Invasive manipulations Example...
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This note was uploaded on 03/30/2008 for the course PSYC 2094 taught by Professor Trcunningham during the Fall '07 term at Virginia Tech.

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Chapter 8part1 notes - Chapter 8 Basic Issues in...

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