An article in Rubber Age (Vol. 89, 1961, pp. 453–458) describes an experiment on the manufacture…

An article in Rubber Age (Vol. 89, 1961, pp. 453–458) describes an experiment on the manufacture of a product in which two factors were varied: reaction time (hr) and temperature (°C). These factors are coded as x1 = (time 12)8 and x2 = (temperature 250)30. The following data were observed where y is the yield (in percent).

(a) Plot the points at which the experimental runs were made.

(b) Fit a second-order model to the data. Is the second-order model adequate?

(c) Plot the yield response surface. What recommendations would you make about the operating conditions for this process?

 

 

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