McGraw-Hill/Irwin Business Research Methods, 10eCopyright © 2008 by The McGraw-Hill Companies, Inc. All Rights Reserved. Chapter 10 Experiments.

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Presentation transcript:

McGraw-Hill/Irwin Business Research Methods, 10eCopyright © 2008 by The McGraw-Hill Companies, Inc. All Rights Reserved. Chapter 10 Experiments

10-2 Causal Evidence Agreement between IVs and DVs Time order of occurrence Extraneous variables did not influence DVs

10-3 Evaluation of Experiments Advantages Ability to manipulate IV Use of control group Control of extraneous variables Replication possible Field experiments possible Disadvantages Artificiality of labs Non-representative sample Expense Focus on present and immediate future Ethical limitations

10-4 Experimentation in the Research Process

10-5 Conducting an Experiment Specify treatment levels Control environment Choose experimental design Select and assign participants Pilot-test, revise, and test Collect data Analyze data

10-6 Experiment: Placement of Benefits Module

10-7 Selecting and Assigning Participants Random assignment Matching

10-8 Quota Matrix Example

10-9 Measurement Options Scaling techniques Physiological measures Physiological measures Options Paper-and- pencil tests Observation Self- administered instruments

10-10 Validity in Experimentation ExternalInternal

10-11 Threats to Internal Validity Threats MaturationHistoryTesting Instrumentation Selection Statistical regression Experimental mortality

10-12 Additional Threats to Internal Validity Diffusion of treatment Compensatory equalization Compensatory rivalry Resentful disadvantaged Local history

10-13 Threats to External Validity Reactivity of testing on X Interaction of selection and X Other reactive factors

10-14 Experimental Research Designs Pre-experiments True experiments Field experiments

10-15 After-Only Case Study X O Pre-experiment

10-16 One Group Pretest-Posttest Design O 1 X O 2 Pre-experiment

10-17 Static Group Comparison X O 1 O 2 Pre-experiment

10-18 Pretest-Posttest Control Group Design RO 1 XO 2 RO 3 O 4 True experiment

10-19 Posttest-Only Control Group Design True experiment RXO1RO2RXO1RO2

10-20 Nonequivalent Control Group Design O1XO2O3O4O1XO2O3O4 Field experiment

10-21 Group Time Series Design R O 1 O 2 O 3 X O 4 O 5 O 6 R O 7 O 8 O 9 O 10 O 11 O 12 Field experiment

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