A chemical engineer is designing the production process for a new product. The chemical reaction that produces the product may have higher or lower yield, depending on the temperature and

the stirring rate in the vessel in which the reaction takes place. The engineer decides to investigate the effects of combinations of two temperatures (55°C, 75°C) and four stirring rates (60 rpm, 80 rpm,100 rpm, 120 rpm)on the yield of the process. She will process two batches of the product at each combination of temperature and stirring rate. a. What are the experimental units and how many in total are required? b. What are the treatments and how many are there? c. Identify the controlgroup, if there is one. d. What is the response variable? e. Identify 2 stages in the experiment where the principle of randomization should be applied.Describe how it is implemented in these stages, respectively.