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Published bySheryl George Modified over 8 years ago
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Experimental Designs 0 = measurement of dependent variable x = manipulation of independent variable R = random assignment of subjects E = change in dependent variable due to independent variable
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After-only X O 1
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One Group, Before-After O 1 X O 2
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Before-After with Control Group Experimental Group (R) O 1 X O 2 Control Group (R) O 3 O 4
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After-Only with Control Group Experimental Group (R) X O 1 Control Group (R) O 2
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Test Marketing Experiment (or other type of study) conducted in a field setting
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Test Markets zStandard
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Test Markets zControlled
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Test Markets zElectronic
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Test Markets zSimulated
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Selecting Test Market Cities Representativeness Ideal city is one where demographic and psychological characteristics most closely match desired population
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Selecting Test Market Cities Degree of Isolation Distribution and promotion should be limited to one geographic area
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Selecting Test Market Cities Ability to Control Distribution and Promotion Distributors and media sources need to be willing and able to cooperate
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Internal Validity Extent to which change in Dependent variable is due to manipulation of independent variable
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Threats to Internal Validity History/Extraneous Factors Specific events in the external environment occurring between first and second measurements that are beyond the control of the experimenter
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Threats to Internal Validity Maturation/Changes in subjects Subjects change in some way over the course of the experiment
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Threats to Internal Validity Testing Initial measurement affects test-taking the second time test is administered
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Threats to Internal Validity Instrumentation/Measure Error Change in method of measuring dependent variable or change in degree of sensitivity or accuracy in measurement instrument
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Threats to Internal Validity Mortality/Drop-Out Withdrawal of subjects from experiment before completion of experiment
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