Source Sum of squares d.f. Mean squares F-value p-value prob>F Model 9.205×1017 2 4.603×1017 41.23 < 0.0001 T 7.426×1017 1 7.426×1017 66.53 < 0.0001 S 1.779×1017 1 1.779×1017 15.94 0.0025 Residual 1.116×1017 10 1.116×1016     Lack of Fita 5.524×1016 6 9.207×1015 0.65 0.6951 Pure Error 5.637×1016 4 1.409×1015     Total 1.032×1018 12       aThe variation of the data around the fitted model.

Table 5: The results ofanalysis of variance for obtained model.

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