Exam 6: Quality and Process Improvement

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One of the principles that total quality management (TQM)stresses is customer satisfaction.

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The UCL and LCL for an Xˉ\bar { X } -chart are 100 ounces and 95 ounces,respectively.The sample size is 5.The inspector looks at the very next unit and finds that it is 108 ounces.What can you conclude? Why?

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Which one of the following is a direct effect of high scrap levels?

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A process is said to be in statistical control when ________,________,and ________ of its distribution does not change over time.

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________ refers to how well the product or service serves its intended purpose at a price customers are willing to pay.

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When customers are upset with their bank because of an incorrect financial statement,the quality provided by the bank is poor from the aspect of

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Most experts estimate the cost of poor quality in the range of 20 to 30 percent of gross sales for defective or unsatisfactory products.

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A manufacturer of silk inspects each bolt of material at the end of the manufacturing process.When the process is in control,it averages 11 defects per bolt.If a 2-sigma control limit is used,what should be done if a bolt is found with 3 defects?

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Inspection stations

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A company is interested in monitoring the number of scratches on Plexiglas panels.The appropriate control chart to use would be

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Use the information from Table 6.3.What is the upper control limit (UCL)if the bank were to use z = 2 and a sample size of 100?

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One chart commonly used for quality measures based on product or service attributes is the X-bar chart.

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Table 6.4 The manager of Kewpie has recently implemented an attribute-based process control method. The accompanying table shows the results of five different samples of dolls from the five weeks of production after the process control method was implemented. Week Sample Size Number Defective 1 100 3 2 100 20 3 100 23 4 100 12 5 100 13 -Assume that the newly implemented control chart has a central line of p = 0.10,with the standard deviation computed from this original value.Assume also that z = 2 is used for defining the control limits and sample sizes of 100 dolls.What can be said about the doll-making process based on the first five weeks of experience from Table 6.4?

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Table 6.1 Factors for Calculating Three-Sigma Limits for the Xˉ\bar { X } -chart and R-chart Size of Sample (n) Factor for UCL and LCL for X - Charts Factor for LCL for R - Charts Factor for UCL for R - Charts 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 0 2.282 5 0.577 0 2.115 6 0.483 0 2.004 7 0.419 0.076 1.924 8 0.373 0.136 1.864 9 0.397 0.184 1.816 10 0.308 0.233 1.777 Source: 1950 Manual on Quality Control of Materials, copyright American Society for Testing Materials. Reprinted with permission. -Historically,the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm.Determine the central line and upper and lower control limits for an Xˉ\bar { X } - and an R-chart,assuming samples of size 8 will be taken.Use Table 6.1.For the R-chart,what is the value of the LCLR?

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Table 6.1 Factors for Calculating Three-Sigma Limits for the Xˉ\bar { X } -chart and R-chart Size of Sample (n) Factor for UCL and LCL for X - Charts Factor for LCL for R - Charts Factor for UCL for R - Charts 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 0 2.282 5 0.577 0 2.115 6 0.483 0 2.004 7 0.419 0.076 1.924 8 0.373 0.136 1.864 9 0.397 0.184 1.816 10 0.308 0.233 1.777 Source: 1950 Manual on Quality Control of Materials, copyright American Society for Testing Materials. Reprinted with permission. -Historically,the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.1 cm.Determine the central line and upper and lower control limits for an Xˉ\bar { X } - and an R-chart,assuming samples of size 8 will be taken.Use Table 6.1.For the R-chart,what is the value of the UCLR?

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Firms should avoid having errors or defects caught and corrected at the source.

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Process capability can be addressed when

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A product is composed of three subsystems that have reliabilities of .999,.997,and .985.What is the overall reliability of this product?

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Internal failure costs result from defects that are discovered after the production of a service or product.

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Table 6.2 Observation Number Sample Number 1 2 3 4 5 1 10.1 10.6 9.8 9.9 10.9 2 9.7 9.5 10.3 9.9 10.5 3 10.1 10.7 9.2 10.0 10.1 4 9.9 9.8 10.5 10.4 10.1 5 10.4 10.1 10.9 9.9 10.3 -Using Table 6.2,for the R-chart,what is the value of LCLR?

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