Operations Management
2nd Edition
ISBN: 9781260484687
Author: CACHON, Gerard
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 9, Problem 6CQ
Summary Introduction
To determine: The correct option for the given information.
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Students have asked these similar questions
Variability is very relevant to quality. That means that in order to have quality products and
processes we need to have variability.
O True
O False
Which of the following statements about Pareto diagrams is correct?a. The Pareto diagram shows the possible root causes of a problem but does not show thefrequency of defect occurrences.b. The Pareto diagram shows the defects in order from most commonly occurring to leastcommonly occurring.c. The Pareto diagram shows the mean of a random sample at various points in time.d. The bars in the Pareto diagram have, on average, roughly the same height.
You start a summer job serving ice cream at the shore. The manager notices that sinceyou started the job, the average portion size given to customers has gone up substantially. This is a result of assignable cause variation. True or false?a. Trueb. False
Chapter 9 Solutions
Operations Management
Ch. 9 - Prob. 1CQCh. 9 - Prob. 2CQCh. 9 - Prob. 3CQCh. 9 - Prob. 4CQCh. 9 - Prob. 5CQCh. 9 - Prob. 6CQCh. 9 - Prob. 7CQCh. 9 - Prob. 8CQCh. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Prob. 11CQCh. 9 - Prob. 12CQCh. 9 - Prob. 13CQCh. 9 - Prob. 14CQCh. 9 - Prob. 15CQCh. 9 - Prob. 16CQCh. 9 - Prob. 17CQCh. 9 - Prob. 18CQCh. 9 - Prob. 1PACh. 9 - Prob. 2PACh. 9 - Prob. 3PACh. 9 - Prob. 4PACh. 9 - Prob. 5PACh. 9 - Prob. 6PACh. 9 - Prob. 7PACh. 9 - Prob. 8PACh. 9 - Prob. 9PACh. 9 - Prob. 10PACh. 9 - Prob. 11PACh. 9 - Prob. 12PACh. 9 - Prob. 2.1CCh. 9 - Prob. 2.2C
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- You work for Raider Data Systems where thousands of insurance records are entered by clerks each day for a variety of client firms. You are in charge of setting control limits to include 99.73% of the random variation in the data entry process when it is in control. Samples that you collected from 20 employees are shown below. You carefully examine 100 records entered by each employee and count the number of errors entered by each clerk. You also compute the proportion defective in each sample. Using a p-chart, what are the upper and lower control limits? Sample Errors Made Proportion Defective 1 4 0.04 2 5 0.05 3 6 0.06 4 3 0.03 5 8 0.08arrow_forwardDesign specifications require that a key dimensions on a product measures 346=12 units . A process is being considered for producing this product has a standard deviation of eight units. The process average has been shifted to 350 so that the process capability is 0.3333. Approximately, what percentage of items produced will be defective?arrow_forwardBoth capability ratio and capability index of a process is 1 (Cp=1 and Cpk=1). This process O may produce 0.3% products which are out of the specification limits O the design specification limits are greater than the control limits O is not capable O is in controlarrow_forward
- In quality assurance, to monitor characteristics that have discrete values and can be counted, we can use a. control chart for variables b. control charts for attributes c. x-chart d. A&Carrow_forwardA point which is outside of the lower control limit a. should be ignored unless another point is outside that limit O b. should be investigated because an assignable cause of variation might be present O c. is impossible since the lower limit is always zero O d. is an indication that no cause of variation is present O e. should be ignored because it signifies better than average qualityarrow_forwardIn quality assurance, to monitor characteristics that have discrete values and can be counted, we can use: a. control chart for variables b. control chart for attributes c. x-chart d. A&Carrow_forward
- Increasing sample size n will affect the control limits of xbar chart and R chart in which way? Select one: a. Widening the control limits of xbar chart and narrowing the control limits of R chart b. Do not change the control limits of both charts c. Narrowing the control limits of both xbar and R charts d. Widening the control limits of both xbar and R charts e. Narrowing the control limits of xbar chart and widening the control limits of R chartarrow_forwardAt Webster Chemical Company, lumps in the caulking compound could cause difficulties in dispensing a smooth bead from the tube. Even when the process is in control, an average of four lumps per tube of caulk will remain. Testing for the presence of lumps destroys the product, so an analyst takes random samples. The following results are obtained: Tube No. Lumps Tube No. Lumps Tube No. Lumps 1 6 5 6 9 5 2 5 6 4 10 0 3 0 7 1 11 9 4 4 8 6 12 2 Determine the c-chart two-sigma upper and lower control limits for this process. Is the process in statistical control?arrow_forwardDesign specifications require that a key dimension on a product measure 100kg plus and minus 3kg. If the value of the quality exceeds the target by the tolerance of 3kg on either side, the product will be likely to fail during the warranty period and cost $480 for repair. A process being considered for producing this product has a standard deviation of 1.5kg A) Suppose the original process average shifts to 99kg, maintaining the current dispersion. Calculate the process capability index after the shift. Is it capable? B) What is the average loss per unit after the shift as in (part a)? Use Taguchi loss function for multi products casearrow_forward
- Design specifications require that a key dimension on a product measure 100kg plus and minus 3kg. If the value of the quality exceeds the target by the tolerance of 3kg on either side, the product will be likely to fail during the warranty period and cost $480 for repair. A process being considered for producing this product has a standard deviation of 1.5kg A) Compute the process capability ratio if the process is centered. Is it capable to meet the quality specification? Explain. B) If the original process in (part A) is incapable, what should be the standard deviation of the process to make it capable? C) Suppose the original process average shifts to 99kg, maintaining the current dispersion. Calculate the process capability index after the shift. Is it capable? D) What is the average loss per unit after the shift as in (part c)? Use Taguchi loss function for multi-products casearrow_forwardDesign specifications require that a key dimension on a product measure 100kg plus and minus 3kg. If the value of the quality exceeds the target by the tolerance of 3kg on either side, the product will be likely to fail during the warranty period and cost $480 for repair. A process being considered for producing this product has a standard deviation of 1.5kg A) Compute the process capability ratio if the process is centered. Is it capable to meet the quality specification? Explain. B) Suppose the original process average shifts to 99kg, maintaining the current dispersion. Calculate the process capability index after the shift. Is it capable? C) What is the average loss per unit after the shift as in (part b)? Use Taguchi loss function for multi-products casearrow_forwardJohn is a newly minted quality engineer at MakeStuff Inc. His boss tells him to increasethe process capability index of their main product. John is somewhat lazy and does notwant to tackle the variation in the process, so he decides to simply increase the upperspecification limit and reduce the lower specification limit. Does this increase the process capability index?a. No, it does not, because the variation in the process stays unchanged.b. Yes, it does, though one might question if the underlying process is really better.c. That depends on many other variables, including the control limits.d. No, the process capability index would only change if the control limits were changed.arrow_forward
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