SOAN 2120 Lecture Notes - Lecture 9: Random Number Generation, Central Limit Theorem, The Times Group

• School: University of Guelph
• Department: Sociology and Anthropology
• Course: SOAN 2120
• Professor: D Walters

Document Summary

Understand the concept of experimental design using design notation. Know the various threat to internal validity. To be able to asses the impact of various threats to internal validity using the experimental design notation. The effect of an dependent variable on an independent variable. Data generated from experiments are the same data you get from a survey. We want the scores to be equivalent: average scores on the dependent variable and, scores on all other variables which are likely to impact the dependent variable. This allows us to know that the differences is due to manipulation. The objective of this is to make sure that each group as an equal probability of assignment: this is essential, because it allows us to know that the differences is due to manipulation. Even with random assignment (ra) the two or more groups will not be exactly equal in all respects.