POLSCI 3N06 Chapter Notes -Random Assignment, Internal Validity, Selection Bias

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Political science 3n06 2013 lecture 5b: experimental methods. Introduce a control group: you have to make sure your control group is exactly the same as the experimental group except that the control group isn"t introduced to the independent variable. Having an equivalent control group is a way to eliminate all other variables and a way to improve your internal validity. The groups have to be treated equally countered by using a control group. Some of the limitations of a one group pretest/post-test design can be: a group that should resemble the experimental group in every aspect but one it is not exposed to the independent variable. Scores between the control group and the experimental group can be compared with the difference being attributed to the independent variable. Using a control group can increase the internal validity of an experiment. Threats to the internal validity of an experiment continued:

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