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Donald Cooper Pamela Schindler

Donald Cooper Pamela Schindler. Chapter 14. Business Research Methods. Chapter 14. Experimentation. Variables in Experiments. Slide 14 - 1. Independent variables Dependent variables. Advantages of an Experiment?. Slide 14 - 2.

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Donald Cooper Pamela Schindler

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  1. Donald Cooper Pamela Schindler Chapter 14 Business Research Methods

  2. Chapter 14 Experimentation

  3. Variables in Experiments Slide 14 - 1 • Independent variables • Dependent variables

  4. Advantages of an Experiment? Slide 14 - 2 • Researcher’s ability to manipulate the independent variable • Contamination from extraneous variables can be controlled more efficiently • Convenience • Cost Replication

  5. Disadvantages of Experiments Slide 14 - 3 • Artificiality of the laboratory • Generalization from nonprobability samples • Larger budgets needed • Restricted to problems of the present or immediate future • Ethical limits to manipulation of people

  6. Experimentation Process Slide 14 - 4 • Select relevant variables • Specify the treatment levels • Control the experimental environment • Choose the experimental design • Select and assign the subjects • Pilot-test, revise, and test • Analyze the data

  7. Ways to Assign Subjects Slide 14 - 5 Random Assignment Matching Assignment • Quota matrix

  8. Does a Measure Accomplish What it Claims? Slide 14 - 6 Internal validity External validity

  9. History Maturation Testing Instrumentation Selection Statistical Regression Experimental Mortality Threats to Internal Validity Slide 14 - 7

  10. Threats to External Validity Slide 14 - 8 • The Reactivity of Testing on X • Interaction of Selection and X • Other Biasing Effects on X • Artificial setting of testing • Respondents knowledge of testing

  11. Experimental Designs Slide 14 - 9 • Preexperimental designs • True experimental designs Field experiments

  12. Design Symbols Slide 14 - 10 Xthe introduction of an experimental stimulus to the respondent 0 a measure or observation activity R an indication that sample units have been randomly assigned

  13. Preexperimental Designs Slide 14 - 11 • One-shot case study • One-group pretest-posttest design • Static group comparison

  14. True Experimental Designs Slide 14 - 12 • Pretest-posttest control group design • Posttest-only control group design

  15. Operational Extensions of True Designs Slide 14 - 13 • Completely randomized designs • Randomized block design • Latin square • Factorial design • Covariance analysis

  16. Field Experiments: Quasi- or Semi-Experiments Slide 14 - 14 • Non Equivalent Control Group Design • Separate Sample Pretest-Posttest Design • Group Time Series Design

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