Known that it is particularly important for a supermarket to reasonably employ cashier staff, reduce customers waiting time and the operating costs of the supermarket and improves efficiency. Waiting time and customer dissatisfaction has a proportional relationship.

Suppose that a store manager such as LULU Hypermarket would like to perform an experiment on the waiting time. He defines the Waiting time waiting time until reach the cashier service time at the cashier Use the context of DOE to help the manager improve the waiting time. Your answer should be in the following sequential approach

a Before the experiments Setting up the experiment, important factors levels...etc eg cashier experience

b During The experiments how would you run the experiment

c Data Collection noise errors...etc

d Analysis of the results list of necessary statistical tests plots...etc

e Types of Conclusion effects of factors....etc