Experimental Design Application Production engineers wish to find the optimal pr

Question

Experimental Design Application Production engineers wish to find the optimal process for etching circuit boards quickly. They create a single replicate 24experiment to test the effect of the following factors on time to etch a circuit board: (A) Concentration of nitric acid in the etchant, (B) temperature of the etchant, (C) stirring rate in the etching tank, (D) surface area of the board. Running this experiment, they obtain the data in Fin EDA.CS Which factors effects and interaction effects are significant? Effect A Effect 8 Effect C Effect D Effect AB Effect AC Effect AD ? Effect BC ? Effect BD Effect CD

Explanation / Answer

Tests of Between-Subjects Effects Dependent Variable:Time Source Type III Sum of Squares df Mean Square F Sig. Corrected Model 675.958a 10 67.596 389.453 .000 Intercept 6345.317 1 6345.317 36558.474 .000 A 139.063 1 139.063 801.210 .000 B .004 1 .004 .023 .887 C .191 1 .191 1.103 .342 D 389.174 1 389.174 2242.223 .000 A * B .025 1 .025 .143 .721 A * C .000 1 .000 .000 .995 A * D .121 1 .121 .696 .442 B * C 147.319 1 147.319 848.776 .000 B * D .052 1 .052 .298 .608 C * D .010 1 .010 .055 .824 Error .868 5 .174 Total 7022.144 16 Corrected Total 676.826 15 Effect P-value significant A .000 Yes B .887 No C .342 No D .000 Yes A * B .721 No A * C .995 No A * D .442 No B * C .000 Yes B * D .608 No C * D .824 No

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