Question: Using graphs or tables to illustrate, explain what is meant by no interaction in modeling a response Y and explanatory variables X and Z, when

Using graphs or tables to illustrate, explain what is meant by "no interaction" in modeling a response Y and explanatory variables X and Z, when

(a) all variables are continuous (multiple regression),

(b) Y and X are continuous, Z is categorical (analysis of covariance),

(c) Y is continuous, X and Z are cate- gorical (two-way ANOVA),

(d) all variables are categorical ("no interaction" = "homogenous association").

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