1.You are employed in a company in which no one has the knowledge of DOE for obvious reasons. The company receives raw materials from five different suppliers. The manager of the QA department wants to investigate the effect of specific property of the raw materials between different suppliers on the yield of the process. However, each supplier's raw material is processed in different machines and machines are operated by different operators and the manager suspects that there could be variations between machines and operators. Your manager wants you to make a design that would eliminate the effects of these two nuisance variables on the response variable. He has the following questions for you:

a.What kind of design should you use to achieve the objectives?(2 marks)

b.Provide a layout of the design defining all the factors and levels.(6 marks)

c.Suppose that the ANOVA table indicates that there are not much variations between operators. In that case, what kind of design would you suggest for future experiment? (2 marks)