11. Consider the following E, V, W model that considers the effect of smoking, as the exposure variable, on cervical cancer status, controlling for the effects of the other four independent variables listed: logit P(X) =+ BSMK+V+NS+AS +73 NSX AS+ SMK X NS +8SMK AS+83SMK NS AS, where the V are dummy variables indicating matching strata and the y are the coefficients of the V variables. Is this model hierarchically well formulated? If so, explain why; if not, explain why not.