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Topic: Psychology
Number of pages / Number of words: 3 / 566
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If both groups experience the same outside events but a change is observed only for the quasi experimental group, we can be more certain that the change was due to X rather than to an outside influence.

- First and the second criteria of an experimental design is met in Quasi Experimental.

o It’s possible to presume a causal variable preceded the effect in time

o The cause and effect co- Vary

o However cannot eliminate alternative explanations...


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o Quasi Experiments do not have internal validity because participants are not randomly assigned to conditions and the researcher may have no control over the independent variable.

- Basic Confounds in Quasi Experimental Design are :

o History

o Maturation (Emotional, Physical & Psychological)

o Mortality

o Testing

- One Group pretest-Post test design :

o Poor research strategy because it fails to eliminate most threats to internal validity...


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