CRIM 320 Lecture Notes - Lecture 9: Analysis Of Variance, John Tukey, Perfective Aspect

• School: Simon Fraser University
• Department: Criminology
• Course: CRIM 320
• Professor: Steph Dawson

Document Summary

Factor is the categorical variable containing our groups. T tests will have 5 percent risk of error (15 percent for three tests) Compares groups means when we have more than 2 independent groups. Null: the population means for all groups is the same. If there are significant group differences, how do we determine which groups are different from each other? online reading lane and meeker article. More difference within our groups then between our groups. Measures association between two interval level variables preliminaries plotting data. Two variables are moving in the same direction. As one variable increases, the other variable also increases. As one variable decreases, so does the other. Purpose of correlation: trying to understand the line correlation. Used to measure the degree of association between two interval level variables. R ranges from -1 to +1 direction and magnitude of r. The closer r gets to 0 the weaker the association is.