10 May WHAT IS THE CUMULATIVE PERCENTAGE OF THE TWO LEFTMOST BARS?
A. Please answer the following True or False questions (each worth 2 points)1) A process is capable if special cause variation is not present in the process. True ______ False______2) Random variation is also referred to as uncontrollable variation.True ______ False______3) Control charts are used to determine if there are unexpected variation in the process.True ______ False______4) Three items in parallel each having a reliability of 0.90 have an overall system reliability of 0.999.True ______ False______5) The lower control limit for an R-chart can be lower than 0. True ______ False______6) Process stability means that there is no common variation in the processTrue ______ False______7) Effective benchmarking must be against the best company in the same industry. True ______ False _______8) A Six Sigma process must have a process capability index of 2.0 or higher.True _____ False________9) In a Normally distributed process the mode and the mean have the same value.True ______ False______10) Quality invariably leads to better financial results.True ______ False_____B. Please answer the following multiple choice questions (each worth 3 points)): 1. A project consists of 3 activities each of which has a variance of 1. The project standard deviation is:A. 1.50B. 1.00C. 3.00D. 0.33E. 1.73 2. ________ are data-gathering tools that can be used in forming histograms.A) Affinity diagramB) Pareto chartsC) Check sheetsD) Scatter plotsE) Control charts 3. Reliability models assume statistical independence between failure events. This means:A. components can fail one at a timeB. if one component fails the entire system failsC. If components are parallel they don’t failD. the failure of one component does not influence another to failE. Components have to be in series to avoid system reliability. 4. The ________ is used to examine the relationships between variables.A) scatter diagramB) process mapC) cause-and-effect diagramD) Pareto chartE) control chart 5. Which of the following is true of nonrandom variation?.A) It is uncontrollable.B) It is centered on a mean.C) It occurs with a somewhat consistent amount of dispersion.D) It could results from a shift in a process mean.E) It results in a process that is repeatable. 6. The final step in the self-assessment process described in the text is to:A. document findingsB. collect dataC. evaluate strengths and areas for improvementD. develop improvement strategyE. make a plan 7. Off line experimentation is performed during the ________ phase of Six Sigma.A. controlB. improveC. analysisD. identificationE. variation 8. What is the Taguchi quality loss for a device that costs $500 to repair and a tolerance of plus or minus 0.5 mm with a mean of squared deviations from the target of 0.75?A. 1000B. 2000C. 375D. 1500E. 750C. 9. __________ variation is centered on the mean and occurs with a consistent amount of dispersion.A. Nonrandom B. ConsistentC. SystematicD. DeliberateE. Random 10. A project manager has calculated the mean duration of her project on its critical path to be 80 days and the variance as 27. The customer is asking for 90% assurance on the completion date. To provide this assurance the PM should revise the duration to _______days.A. 85 B. 87C. 94D. 81 C. Please respond to the following questions. Each question is worth 10 points: 1) 97.1) A quality control engineer is checking the performance of a bottling machine. He collects 8 samples each consisting of six bottles. He carefully measures the content of each bottle. The data in fluid ounce are presented below. He notices variability in the data. Plot the X-bar and R charts and interpret the process performance. Is the process under control? If not which samples are out of control? Sample Measurements 3) The RC and More Superstore decides to track customer complaints as part of their ongoing customer satisfaction improvement program. After collecting data for two months their check sheet appears as follows:Type of Problem Frequency(number of times)Batteries not included 6Items damaged when received 21Literature not included in box 9Parts missing 13Unit not working 1Construct a Pareto chart including the cumulative % frequency. What is the cumulative percentage of the two leftmost bars? 4) A product manager has conducted a customer satisfaction survey of 30 customers on a scale of 1 to 5. The survey data is shown below. Calculate the mean and standard deviation of the survey and plot a histogram of the data. Does the distribution approximate Normal?Customer Satisfaction rating1 42 33 24 55 56 27 18 49 310 411 412 513 314 315 216 117 518 319 420 321 422 223 424 425 326 327 328 229 230 35) A project manager at COMSOFT corporation has collected statistics on the organization’s software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of design errors discovered in design reviews for each project. .Describe what type of control chart you can use and how do you calculate the control limits to check if the software design process in this organization is in control.
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