Look for a data set which consisting of 3 predictors (Quantitative variable) and a response variable (Quantitative variable) which are of your interest. Qualitative variables are not allowed. The data set must be at least 40 observations. After that, test whether the proposed model is significant or not and test the significance of interaction variables and interpret the result. Construct scatter plots of studentized residuals versus fitted values, ?̂, normal plot, and studentized deleted residuals versus ?1,?2, and ?3. Then check the adequacy of all assumptions.