Gangsa Tiles Sdn. Bhd. a tile manufacturing factory manufactured a batch of tiles for use of floor finishing for a housing estate. The tiles are produced and kept in the corrugated cartoon boxes for shipment. Sample size of 50 is taken in every 2 hours production and visually inspected for crack, blurry color, warping, and edge chipping off. The data collected for 6 shifts is shown in Table 6. (a) From the above raw data, find values which are necessary for construction of an attribute control chart. (b) (c) (d) Subgroup no 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Sample Size n 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 500 No. Nonconforming np 30 31 29 25 28 30 29 50 27 Construct the Attribute Control Chart (ACC). Give TWO (2) general comments for ACC in (b). 30 29 28 20 21 20 19 20 21 19 18 Table 6: Data Collected for 6 Shifts (6 marks) (8 marks) (2 marks) The outlier (if any) was considered as an assingeable cause. Investigate and suggest TWO (2) possible root causes for the outlier existance. (4 marks)
