Question: 28. To see whether thrust force in drilling is affected by drilling speed (A), feed rate (B), or material used (C), an experiment using four

28. To see whether thrust force in drilling is affected by drilling speed (A), feed rate (B), or material used (C), an experiment using four speeds, three rates, and two materials was performed, with two samples (L  2) drilled at each combination of levels of the three factors. Sums of squares were calculated as follows: SSA  19,149.73, SSB  2,589,047.62 ?

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