2. Nature of Correlational Research. Assumptions of Linearity and Additivity LinearityAdditivityAssumes no interactionsFactors affecting Correlational CoefficientReliability of the measureRestriction of range (p 226 fig 8-2)Outliers (p 226, fig 8-2)? Using your data set, insert an outlier that will cause the bivariate correlation to exceed significance beyond p <.001. what value was necessary to achieve it? Subgroup Differences (227. fig 8.3)).