Which ofthe following are assumptions for multiple regression? Choose all that apply. (9 the response variables have a mean of zero the error terms have a common variance the error terms are normally distributed the explanatory variables and the response variable are independent of each other the explanatory variables are normally distributed the response variable is a linear function of the explanatory variables the error terms are independent of each other @@@@O 4 Points Which of the following conditions might cause problems with the parameter estimates of a general linear model? A Categorical independent variables B multicollinearity C non-linear terms in the model D non-normal error terms E interaction between explanatory variables F variance inflation factor G dummy variables 4 Points If there is interaction between the explanatory variables in multiple regression, what sort of term should you add to the model? A a non-linear term B a higher-order term C a dummy variable D a cross-product term