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(a) Two different and independent production methods in AQA factory are selected. The yield for 2 hourly production is recorded and shown as in Table Q4(a). At 0-0.05, is there any difference in the yield of two production method? How would you solve this problem? Table Q4(a) The yield for 2 hourly production Method 1 14 19 12 11 15 20 21 15 23 27 13 Method 2 17 19 10 31 22 26 24 14 16 18

6) A chemical process that using three catalysts is monitored. Table 04(b) shows the yield data from the process. Table 4(b) Data from a chemical process Catalyst C2 C1 C3 77.5 81.5 78.1 82.0 82.3 80.2 80.6 81.4 81.5 84.9 79.5 83.0 81.0 83.0 82.1 By assuming that the process in not normally distributed, is there any different in yielded data for the three catalysts used in that chemical process? (Use 0.05 level of significance).