Exam 6: Quality and Process Improvement

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Mean time between failures,failure rate per month,and average percentage of late arrivals are examples of which aspect of high-performance design?

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C

A(n)________ is a diagram that relates a key quality problem to its potential causes.

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cause-and-effect diagram

Which one of the following is a consequence of external failures?

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C

The UCL and LCL for an Xˉ\bar { X } -chart are 25 and 15 respectively.The central line is 20,and the process variability is considered to be in statistical control.The results of the next six sample means are 18,23,17,21,24,and 16.What should you do?

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The Deming wheel depicts a cycle with the following four steps: ________,________,________,and ________.

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Benchmarking involves four basic steps,which are

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A retail store wants to see if the accuracy of the prices that were entered into its database used for its cash registers is in control.It has collected 10 samples of size 500.The number of errors is found in the table below.Construct a 3-sigma p-chart to determine if this entry process is in control. Sample Number Wrong Price Entries 1 5 2 2 3 7 4 1 5 3 6 2 7 8 8 1 9 3 10 4

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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 -Use the information in Table 6.4.The manager of Kewpie has decided to redesign the process control method (both central line and control limits)based on just the data from weeks 1-5.What is the new UCL? (Assume z = 2)

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The manufacturing of compact disks requires four steps.The reliabilities of the steps are 0.80,0.85,0.95,and 0.90 respectively.What is the reliability of the process to produce a good compact disk?

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________ is an approach to teamwork that moves responsibility for decision farther down the organizational chart--to the level of the employee actually doing the job.

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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-chart,what is the value of UCL Xˉ\bar { X } ?

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A(n)________ is a bar chart on which the factors are plotted in decreasing order of frequency along the horizontal axis.

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One of the principles that total quality management (TQM)stresses is process reengineering.

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One function of control charts for variables is to monitor the mean of the process distribution.

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Which one of the following statements about quality control is TRUE?

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Which one of the following statements about quality is generally FALSE?

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The aspect of high-performance design that concerns the likelihood of a product working properly or service being performed during a specified period is termed ________.

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Samples of 100 checks each were taken at a bank from an encoding machine (which records the amount of a check)over a five-day period.Details are summarized in the Table 6.3.If the bank were to use the average proportion defective from these five samples as the central line for a process control chart,what would be the central line?

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Historically,the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day.Management would like to specify the control limits for an Xˉ\bar { X } -chart with a sample size of 10 and 3 sigma limits.The UCL for the chart would be

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Which one of the following statements about total quality management is TRUE?

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