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MIE364S_LH_4_09 - MIE364H1S Methods of Quality Control and...

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MIE364H1S Methods of Quality Control and Improvement Instructor: Prof. V. Makis Handout #4 Factorial Design – 2 Factors A company wishes to consider changing the way in which one of the materials that it uses in its fabrication process is made. Two subcontractors are invited to make five samples prepared by the old method, five samples prepared by the new method I and five samples prepared by the new method II. The response is the tensile strength of the material and a higher value is desirable. 1. Is there a significant difference between the methods? 2. Is there a significant difference between the suppliers? 3. Is there evidence of interaction? Data Display Row Y Method Supplier ResI1 FitS1 1 130 1 1 4.2 125.8 2 124 1 1 -1.8 125.8 3 128 1 1 2.2 125.8 4 125 1 1 -0.8 125.8 5 122 1 1 -3.8 125.8 6 125 1 2 -1.8 126.8 7 129 1 2 2.2 126.8 8 127 1 2 0.2 126.8 9 127 1 2 0.2 126.8 10 126 1 2 -0.8 126.8 11 128 2 1 -0.6 128.6 12 127 2 1 -1.6 128.6 13 133 2 1 4.4 128.6 14 126 2 1 -2.6 128.6 15 129 2 1 0.4 128.6 16 135 2 2 1 134 17 137 2 2 3 134 18 134 2 2 0 134 19 136 2 2 2 134 20 128 2 2 -6 134 21 121 3 1 -2.4 123.4 22 129 3 1 5.6 123.4 23 117 3 1 -6.4 123.4 24 127 3 1 3.6 123.4 25 123 3 1 -0.4 123.4 26 126 3 2 1.4 124.6 27 119 3 2 -5.6 124.6 28 130 3 2 5.4 124.6
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