POLSCI 3N06 Lecture Notes - Selection Bias, Internal Validity, Dependent And Independent Variables

• School: McMaster University
• Department: Political Science
• Course: POLSCI 3N06
• Professor: Todd Alway

Document Summary

Measure your dependent variable- apply independent variable. Problems of inference- there can be some internal validity issues. The environment can be affected by more external factors that may effect the dependent variable. External variables might affect it; maturational changes over the course of the experiment. They can make our internal validity rather low. 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: And then splitting the pairs with one member going into the control and one into the experimental group. The glasses affect" might be true in the lab but not in reality"/ the real world. B) reactivity will people act the same way when they are being observed by an experimenter.