A chemical engineer is desiging the production process for a new product. The chemical reaction that produces the product may have higher or lower yield, depending on the light, temperature, and stirring rate in the vessel in which the reaction takes place. The engineer decides to investigate the effects of combinations of light levels (), two temperatures (40°C and 50°C) and four stirring rates (30 rpm, 60 rpm, 90 rpm, and 120 rpm) on the yield of the process. She will process four batches of the product at each combination of temperature and stirring rate.
(a) What are the experimental units in this experiment?
the yield of each batch
the stirring rate
the temperature
the batches of the product
What is the response variable in this experiment?
the yield of each batch
the temperature
the batches of the product
the stirring rate
(b) How many factors are there?
How many treatments are there?
Use a diagram to lay out the treatments. (Do this on paper. Your instructor may ask you to turn in this work.)
(c) How many experimental units are required for the experiment?