Problem 1: An L9 orthogonal array material processing experiment was designed as follows: Level 1 Level 2 Level 3 A: Pre treatment A1 = HCL A2 = H2504 A3 = HCL (Two levels are chosen) B: Treating Temp. B1= 190 F B2= 200 F B3= 220 F C: Treating Method C1= dip C2= spray C3 = soak D: Additive D1= alcohol D2= Ethanol D3= H20 With the following results: 10, 12, 11, 13, 14, 9, 11, 9, 10and 10. Assume Larger is the better Exp#. A B C D RESULT DONJAUAWNE WOWNNN-. WNEWNOWN. NEW-WNWNA -UNNEWWN- 10 10 1. Perform ANOVA Analysis by hand and include all calculations for all factors. If you are using Excel, then show at last one factor calculations by hand. Please see the partial solution for the Anova in the week 3 BB folder. 2. Determine which factors are significant (F test) and the % contribution of significant factor(s). Please use the Taguchi rule of > 5% contribution. Do not use the F test for significance. 3. Predict the expected value (EV) and the confidence interval (CI), based on significant factors only based on Taguchi > 5% significance rule and + 2 Terror CI interval. 4. If you used the F test for significance, would the results be different? (One sentence only) 5. What can you declare about interactions in this experiment? (One sentence only)