An article in Tappi (Vol. 43, 1960, pp. 38–44) describes an experiment that investigated the ash…

An article in Tappi (Vol. 43, 1960, pp. 38–44) describes an experiment that investigated the ash value of paper pulp (a measure of inorganic impurities). Two variables, temperature T in degrees Celsius and time t in hours, were studied, and some of the results are shown in the following table. The coded predictor variables shown are

 and the response y is (dry ash value in %) 103.

(a) What type of design has been used in this study? Can the design be rotated?

(b) Fit a quadratic model to the data. Is this model satisfactory?

(c) If it is important to minimize the ash value, where would you run the process?

 

 

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