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...Chapter outline overview correlation regression analysis copyright pearson education inc if variances are similar t tests appropriate group a b not could be misleading and can help coefficient the r summarizes strength of association between two metric interval or ratio scaled variables say x y in other words you have for likert scale items dichotomous it is an index used to determine whether linear straight line relationship exists as was originally proposed by karl known relationships example how much does weight go up height goes one unit positively correlated...