Question: An article in Rubber Chemistry and Technology (Vol. 47, 1974, pp. 825836) describes an experiment that studies the relationship of the Mooney viscosity of rubber

An article in Rubber Chemistry and Technology (Vol. 47, 1974, pp. 825–836) describes an experiment that studies the relationship of the Mooney viscosity of rubber to several variables, including silica filler (parts per hundred) and oil filler (parts per hundred). Some of the data from this experiment are shown in Table 8E.6, where (silica 60)/15 and .

a. What type of experimental design has been used? Is it rotatable?

b. Fit a quadratic model to these data. What values of and will maximize the Mooney viscosity?

(silica 60)/15

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