Chapter 10 - Chapter 10: Quasi- Experimental Designs 1....

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Chapter 10: Quasi- Experimental Designs 1. Quasi- Experimental Design a. An experimental procedure is applied but all extraneous variables are not controlled b. Lacks random assignment of participants to groups c. Weak designs-----------------quasi--------------strong d. 3 prerequisites for this design: d.i. Cause and effect must covary- relationship between IV and DV d.ii. Cause must precede effect- changes in IV must precede changes in DV d.iii. Rival hypothesis must be implausible- no confounding extraneous variable e. Principles used to rule out rival explanations in quasi-experiments e.i. Identification and study of plausible threats to internal validity e.i.1. Identifying plausible rival explanations and then probing and investigating them to determine how likely it is that they can explain the covariation between the treatment and the outcome e.ii. Control by design e.ii.1. Adding design elements to either eliminate a rival explanation or obtain evidence about the plausibility of the rival explanation e.iii. Coherent pattern matching e.iii.1. Principle can be used when a complex prediction can be made about a casual hypothesis, and there are few rival explanations that would make the same prediction. If the complex prediction is supported by the data, most rival explanations are eliminated. The more complex the prediction, the less likely it is
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This note was uploaded on 12/10/2011 for the course PSYC 207 taught by Professor Lewis during the Fall '07 term at University of Delaware.

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Chapter 10 - Chapter 10: Quasi- Experimental Designs 1....

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