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Question 1 Customers' establishing new bank accounts at the BSP bank in Suva are expected to average 10 minutes each. Numerous observations of these samples
Question 1 Customers' establishing new bank accounts at the BSP bank in Suva are expected to average 10 minutes each. Numerous observations of these samples were taken, as presented below. From the sample data given, construct the relevant control charts. Do the results suggest that the process is in control? Why or why not? Explain Sample ] Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 9.5 10.3 9.9 10.3 9.6 10.2 8.4 9.9 10.5 10.4 10.9 8.9 9.8 10.2 90 10.8 10.8 9.7 10.3 10.5 10.8 10.6 10.1 10.5 Question 2 (a) What type of control chart would you use to control the following process? Why? Lot number Number inspected Number of units outside specifications 1050 26 585 53 139 32 72 23 210 30 (b) What type of control chart would you use to control the following process? Why? Lot number Rolls of cloth Number of defects produced inspected 40 28 40 29 40 28 40 30 40 30(c) A production analyst takes 12 samples of jelly beans from production over a shift period. The number of minor defects in each sample is shown below. Sample Number of defects 6 5 6 7 8 10 17 Develop the appropriate control chart for this process. Does the process appear to be in control? Why? APPENDIX Control Chart Factors Subgroup A2 D3 D4 d3 Size 2 1.880 0.000 3.267 1.128 0.853 1.023 0.000 2.574 1.693 0.888 4 0.729 0.000 2.282 2.059 0.880 5 0.577 0.000 2.114 2.326 0.864 6 0.483 0.000 2.004 2.534 0.848 7 0.419 0.076 1.924 2.704 0.833 For reference or clarification of the terms or keywords, please look up for; Evans, J.R., and Lindsay, W.M (2017), Managing for Quality and Performance Excellence, 10thedition, South- Western Cengage Learning, USA
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