CRIM 220 Lecture Notes - Lecture 4: Johann Eck, Construct Validity, Quasi
31 Oct 2016
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Document Summary
An experiment = process of observation cj research, to be carried out in a situation expressly brought about for that purpose. Involves taking action + observing the consequences of that action. Well suited for hypothesis testing (explanation, evaluation etc. ) Best way to achieve comparability in the experimental and control groups. Produces experimental and control groups that should be equivalent. Variables, time order, measures, groups = 4 central features. Tests the effects of an experimental stimulus on some dv through the pretesting and post-testing of experimental and control groups. Experimental group = exposed to iv, control group is not exposed to iv. Dv = the effect, the outcome, value depends on the iv. Classical experiment with random assignment of subjects guards against most of the threats to internal validity. May be modified to suit specific research purposes by changing the number of experimental and control groups, the number and types of experimental stimuli, and the number of pretest/post-test measurements.
