The supply chain director would like to analyze the relationship of the variables in the dataset with customer delivery satisfaction score a. derive a regression model. 

a. Develop an appropriate multiple regression model to explain the variability in customer satisfaction scores. Assume alpha .001  

b. Interpret the regression results. 

c. Discuss the outliers and normality assumptions and comment on the suitability of a multiple linear regression model [2 marks] 

d. How can you potentially improve the model?