Q5 (a) (b) Variable Control Chart known as a graphical record of a particular quality characteristic. List FOUR (4) objectives of Variable Control Chart. (4 marks) The XYZ Manufacturing wishes to monitor and control the product's dimension during machining process. Each data are taken based on data of measurements as summarized in Table Q5 (b). [Refer Table B for the value of 42, D3 and D4]. (i) Determine the control limits for the X-bar chart. (6 marks) (ii) Determine the control limits for the R-chart. (5 marks) (iii) Plot the X-bar chart for preliminary data with trial control limits (2 marks) (iv) Plot the R-chart for preliminary data with trial control limits. (2 marks) (v) Discuss the quality condition of the dimension measurements. (1 mark) Table Q5 (b) Date Time 03/09 Xs 7.4 5.7 5.9 04/09 Subgroup Number 1 2 3 4 5 6 7 8 9 10 7.3 08:00 14:00 08:00 14:00 08:00 14:00 08:00 14:00 08:00 14:00 05/09 Measurements (mm) X2 X3 X4 5.8 6.1 6.9 6.2 6.5 5.9 6.5 7.3 6.1 5.8 7.4 5.3 6.5 5.8 6.6 7.3 6.4 5.9 6.1 6.2 5.9 5.3 5.8 5.7 6.6 6.5 6.9 5.9 7.3 X1 6.0 6.2 6.0 6.6 5.8 6.8 6.9 7.2 5.9 6.7 06/09 7.4 5.8 5.8 6.4 6.2 5.9 07/09 6.0