CRIM 320 Lecture Notes - Lecture 5: Statistical Parameter, Confidence Interval, Standard Deviation

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We suspect a relationship between two or more variables in a given population. H1: the number of crimes committed by males and females is different. H2: drug-users and non-drug users differ as to number of violent crimes committed. H3: the frequency of crime is different in inner-city neighborhoods that in suburban neighborhoods. Making statement about the effect of an iv (e. g. , gender, drug use, location) on the dv (e. g. , number of crime) Hypothesis are explicitly states as: h1, h2, etc. Hypothesized effect of an iv on a dv that we believe true in the population: Association between two variables: ex: lower parental supervision is associated with a higher # of problem beh committed by children. Group differences on one variable: ex: adolescent gang members are more likely to continue offending in adulthood than non gang members. In statistics, however, we test for the null hypothesis. Statement of no difference or no association between a iv and a dv.