Question: Q1.In a linear regression setting, we have a single response Y and two covariates, X and Z. The population model is: =0+1+2+ With respect to

Q1.In a linear regression setting, we have a single response Y and two covariates, X and Z. The population model is:

=0+1+2+ With respect to the effect of X on the response Y, is Z considered to be an effect modifier?

Q2.In a linear regression setting, we have a single response Y and two covariates, X and Z. The population model is:

=0+1+2+3+

With respect to the effect of X on the response Y, is Z considered to be an effect modifier?

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