Ch 8 - control groups Manipulation check Types of...

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Quantitative Research Designs Descriptive, Quasi- experimental, and Experimental Research
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Experimental Research Involves the recording of measurements and observations made by defined procedures and in defined conditions, to determine the existence of significant differences between groups and relationships among variables.
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Characteristics of Experiments Researcher-controlled manipulation of independent variables Random assignment of participants to conditions
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Appropriate Uses of Experiments To identify differences between groups To explore conditions under which a phenomenon occurs To determine causation
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Advantages of Experiments Because the researcher has a great deal of control of the situation, (s)he can test theories and relationships between variables by: Ensuring the presence of certain conditions and variables Eliminating many confounding variables Comparing groups for which the only difference is the IV
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Procedures Random assignment of participants to groups Treatments, placebos, and
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Unformatted text preview: control groups Manipulation check Types of Experimental Designs Posttest; pretest-posttest Longitudinal (multiple measures of DV) To test long-term effects To test cumulative effects Factorial (to test more than one IV or interactions between Limits of Experiments Ethics Practicality Artificiality/reduction of real-life complexity Other Quantitative Designs Quasi-Experiments & Field Experiments Descriptive Designs No direct control over IVs, no random assignment, and no assurance of temporal order Descriptive, not predictive Need for caution in interpretation More realistic than experiments Researcher Effects & Procedural Bias Effects of researchers identity, communication style, etc. on participants Demand characteristics participants might guess what the researcher wants Use of blind confederates or coders Research protocols & training...
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This note was uploaded on 01/03/2011 for the course COM 3083 taught by Professor Deturk during the Spring '10 term at The University of Texas at San Antonio- San Antonio.

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Ch 8 - control groups Manipulation check Types of...

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