An article in Rubber Chemistry and Technology (Vol. 47, 1974, pp. 825836) describes an experiment that studies

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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  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?

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Managing Controlling and Improving Quality

ISBN: 978-0471697916

1st edition

Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund

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