CRIM 320 Lecture : Crim 320 week 12.docx
Document Summary
Topics: what is a correlation, when it should and should not be used, what are the underlying assumptions, how to conduct a correlation, how to test simple hypothesis. The mean score is very important, therefore you can"t use categorical variables. There is a hypothesis that lower iq is likely to be convicted but not more self-reported delinquency. More delinquent friends may be associated with more self reported delinquency. But a third variable could be that they participants also have a delinquent member in the family. Hypothesis: h1: the earlier the age of onset of delinquency, the more crimes will be committed. Null hypothesis: h0: the age of onset of delinquency is not related to the number of crimes committed. Correlation is a standardized measure: score divided by standard deviation. Easier to interpret than covariance: metric of both variables is often different. Guidelines for interpreting the strength of the relationship: 1. 00=perfect relationship