mc 3018 experiemtnal research

mc 3018 experiemtnal research - EXPERIMENTALRESEARCH

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EXPERIMENTAL RESEARCH MC3018 Foundations of Media Research
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EXPERIMENTAL RESEARCH MC3018 Foundations of Media 2 Types of Experimental Research: Laboratory Experiments Field Experiments Quasi Experiments Origins in the physical sciences
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THE LOGIC OF THE EXPERIMENT MC3018 Foundations of Media 3 If the only difference between two identical groups is the experimental condition applied to one group and not the other, then any differences in the two groups after the introduction of the experimental condition must be due to the experimental condition (independent variable).
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MAJOR PURPOSE OF THE EXPERIMENT MC3018 Foundations of Media 4 The major goal or purpose of the experiment is to demonstrate the presence or absence of a causal relational between two or more variables.
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EXPERIMENTAL RESEARCH MC3018 Foundations of Media 5 In an experiment, the researcher can isolate or manipulate a single variable at a time to see how one variable affects the other. The independent variable is manipulated by the experimenter to see how it affects the dependent variable.
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EXPERIMENTAL RESEARCH MC3018 Foundations of Media 6 Example: Effects of film on children’s attitudes (Payne Fund) Film Attitudes Independent Variable Dependent Variable How does film “vary?”
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EXPERIMENTAL RESEARCH MC3018 Foundations of Media 7 Example: Effects of film on children’s attitudes (Payne Fund) Really, it’s this: Experimental Group FILM ATTITUDE Control Group NO FILM ATTITUDE Independent Variable Dependent Variable
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EXPERIMENTAL RESEARCH MC3018 Foundations of Media 8 However, to assess the effect of the experimental variable it is best to compare the experimental and control groups before and after the introduction of the experimental “treatment” or condition: 1. Initial comparison = pretest (both groups) 2. Give experimental treatment (experimental group only) 3. Second comparison = posttest (both groups) Classic Experimental Design
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CLASSIC EXPERIMENTAL DESIGN MC3018 Foundations of Media 9
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SELECTION OF SUBJECTS MC3018 Foundations of Media 10 The experimental and control groups must be similar at the beginning of the experiment. There are two main ways to select subjects:
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This note was uploaded on 10/19/2011 for the course MC 3018 taught by Professor Jeong during the Spring '08 term at LSU.

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mc 3018 experiemtnal research - EXPERIMENTALRESEARCH

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