SOAN 2120 Lecture Notes - Lecture 16: Central Limit Theorem, Random Assignment, Design Of Experiments
28 Jan 2017
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Learning objectives: understand the concept of experimental designs using design notation, know the various threats to internal validity, assess the impact of various threats to internal validity using experimental design notation. Experimental designs: looking at the effect of an independent variable on a dependent variable, equivalent: Scores on all other variables which are likely to impact the dependent variable: differences: are attributable to the manipulation, how do we establish equivalence of two or more groups, researchers use a random number generator. Experimental design notation: standard notation: page 173, x represents an experimental variable or effect. (the independent variable), o represents a dependent variable observation. This experiment has a pre-test and a post-test. The pre-test for the experimental group (o1). The pre-test for the control group (o3). Finally, the letter r denotes random assignment. Experimental designs (many groups): simulated driving game to assess the impact of various substances on driving impairment.
