As an engineering student. It is important that we need have the skills to set up an experiment and collect the results to analyse the different factors. Thus, in this week's lesson, we learned about the design of experiments. It is a methodology to obtain the knowledge of a complex, multivariable process with the fewest trials possible by using the skills call fractional factories design. To enhance what I lesson in the lessons, I will practice the design of the experiment skill by using a case study. Case study: In a wastewater treatment facility, a combination of coagulant chemicals, treatment temperature, and stirring speed were identified as a critical factor to treat the wastewater. the clean water produced is recycled back into the main process and at the same time reduce the amount of the pollutant discharged by the plant. 8 runs were performed and the data are shown below. The response variable (y) is the amount of pollutant discharge(Ib/day) A = concentration of coagulan...