Quasi-experiments_-_notes_version - 1 Quasi-experiments...

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Unformatted text preview: 8/28/2010 1 Quasi-experiments Quasi-Experimental designs Quasi-Experiments: designs that lack all of the control features of true experiments “A research design in which an experimental procedure is applied but all extraneous variables are not controlled.” Inability to randomly assign participants to conditions is the Inability to randomly assign participants to conditions is the most common reason for the use of quasi-experiments Quasi-experiments do not allow same confidence in causal inferences as true experiments Reduced confidence in internal validity Quasi-experiments Most common types of quasi-experimental designs: One group pre-test/post-test design Non-equivalent control group design Time series analysis Reversal (ABA) design One group pre-test/post-test design Same as pretest-posttest design but no random assignment to multiple conditions No control condition; only experimental “Hot Dogs Increase IQ Scores” (National Enquirer Headline) Take Mini-IQ test Eat a hot dog Re-Take Mini-IQ test 8/28/2010 2 One group pre-test/post-test design Empirical study to test the effectiveness of a relationship improvement program: Marital satisfaction Marital satisfaction Share feelings program Marital satisfaction rating Marital satisfaction rating Share feelings program Problems with one group pre-test/post-test History effects – any event that happens between pre- and post-test is confounded with the manipulation Maturation – systematic changes in individuals over time confounded with the manipulation Testing any effects of pre test on pos tes Testing – any effects of pre-test on post-test Instrument Decay – Post-test measurement of dependent variable has changed since pre-test measurement Regression toward the mean – problematic when subjects are chosen...
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This note was uploaded on 12/18/2010 for the course PSY 7 taught by Professor Sherman during the Summer '09 term at UCSB.

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Quasi-experiments_-_notes_version - 1 Quasi-experiments...

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