Chapter 7 - 1-13-03 I) Chapter 7 Quasi-Experimental...

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1.13.3 Chapter 7 – Quasi-Experimental Research Designs I) Quasi-Experiment – researchers only have partial control over their independent variable. People are chosen for different control conditions by other means then random assignment (they are chosen for how their personalities or whatever serves as the individual variable). a. Problem – person confounds come into play without random assignment. The personality trait they were chosen for could be influenced by a person confound that also influences the dependant variable. b. Advantages i. High external validity ii. Since researchers sometimes can’t afford to play out a certain scenarios in a lab it is better to just wait for these scenarios to play out in nature iii. True Experiments are sometime unethical (e.g. – find out more about AIDs by randomly assigning a group of people to receive it) 1. In situations where what they are studying could cause physical/psychological harm c. Types i. Person-by-Treatment Quasi-experiment – researcher measures one independent variable, in the person, and then manipulates another independent variable, through the lab 1. Researcher does use random assignment in assigning groups to different condition groups in respect to the second independent variable
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Chapter 7 - 1-13-03 I) Chapter 7 Quasi-Experimental...

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