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Q6 (LO 3.2/3.3/D3 Analyse how zero defects could be implemented to reduce mistakes) The following data was obtained when measurements of the zinc concentration (measured as % Concentration) were made in a chemical process. The mean and range values of 20 samples (sample size 5) are given in the table. Sample no. Mean (% ) Range (%) 1 6.97 0.38 2 6.93 0.20 3 7.02 0.36 4 6.93 0.31 5 6.94 0.28 6 7.04 0.20 7 7.03 0.38 8 7.04 0.25 9 7.01 0.18 10 6.99 0.29 11 7.05 0.23 12 6.92 0.21 13 7.00 0.28 14 6.99 0.20 15 7.08 0.16 16 7.04 0.17 17 6.97 0.25 18 7.00 0.23 19 7.07 0.19 20 6.96 0.25 Calculate the control limits and plot for Mean & Range. What would be your reaction be to the specification of the process being 7.00 +/- 0.25%..?

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