Question 4. Control Charts for Attributes Surface defects have been counted on 25 rectangular steel plates, and the data are shown in Table 4. Set up a control chart for nonconformities using these data. Does the process of producing the plates appear to be in statistical control? Table 4 Plate Number of Number Nonconformities Number Plate Number of Nonconformities 1 1 14 0 2 0 15 2 3 4 16 1 4 3 17 3 5 1 18 5 6 2 19 4 7 5 20 6 8 0 21 3 9 2 22 1 10 1 23 0 11 1 24 2 12 0 25 4 13 8 1 Mark * Use Excel to plot the control chart and insert it in the space provided below. 0.10 marks for chart formatting; 0.50 Control Chart; 0.40 Explanation