Concept explainers
a)
To determine: The upper control limit and lower control limit on a control chart.
Introduction: Control charts used to determine whether the process is under control or not. Attributes and variables are the factors under the control charts.
b)
To determine: Whether the process is in control.
Introduction: Control charts used to determine whether the process is under control or not. Attributes and variables are the factors under the control charts.
c)
To plot: The values in the graph.
Introduction: Control charts used to determine whether the process is under control or not. Attributes and variables are the factors under the control charts.
d)
To determine: CB’s report about the service quality.
Introduction: Control charts used to determine whether the process is under control or not. Attributes and variables are the factors under the control charts.
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Chapter 6 Solutions
EP PRIN.OF OPERATIONS MGMT.-MYOMLAB
- ces Inter-State Moving and Storage Company wishes to establish a control chart to monitor the proportion of residential moves that result in written complaints due to late delivery, lost items, or damaged items. A sample of 50 moves is selected for each of the last 12 months. The number of written complaints in each sample is 8, 7, 4, 8, 2, 7, 11, 6, 7, 6, 8, and 12. Click here for the Excel Data File a. Insert the mean proportion defective, UCL, and LCL (Leave no cells blank - be certain to enter "0" wherever required. Round your intermediate calculations and final answers to 2 decimal places.) Mean proportion defective UCL LCL c. Does it appear that the number of complaints is out of control for any of the months? Yes ONOarrow_forwardXYZ Rural Bank implemented its initial attempts to manage the performances of its 150 employees. XYZ Rural Bank has 10 branches all over Zamboanga Peninsula and each branch is supervised by a branch manager and has 10-15 employees working directly under his supervision. In its initial implementation of its own performance management system, its HR department sent a Performance Appraisal (PA) Template that all branch managers need to fill out. PA tool includes the following aspects of the employees performances:• Attendance (lates, absences, undertime etc)• Successful collection done (for Account Officers, Loan Officers, Credit Investigators)• Loans processed (For Account Officers and Loan Officers) Every July and January, all branch managers should submit the filled-out PA templates to HR for recording and consolidation. One week before the deadline for such PA template to be submitted to HR, the branch managers fill out the templates themselves based on their own observations. These…arrow_forwardSouth Africa Airways would like to monitor its airline’s performance. Each week for the past 20 weeks, they checked each week a random sample of 100 flight arrivals for “one-time” performance. The table that follows contains the number of flights that did not meet South Africa Airways definition of “one time”: Week Late flights 1 2 2 4 3 10 4 4 5 1 6 1 7 13 8 9 9 11 10 0 11 3 12 4 13 2 14 2 15 8 16 2 17 3 18 7 19 3 20 2 Which control chart is appropriate to analyze the above data? Justify your answerarrow_forward
- South Africa Airways would like to monitor its airline’s performance. Each week for the past 20 weeks, they checked each week a random sample of 100 flight arrivals for “one-time” performance. The table that follows contains the number of flights that did not meet South Africa Airways definition of “one time”: Week Late flights 1 2 2 4 3 10 4 4 5 1 6 1 7 13 8 9 9 11 10 0 11 3 12 4 13 2 14 2 15 8 16 2 17 3 18 7 19 3 20 2 Calculate the upper and lower control limits for this chart.arrow_forwardQuestion 1: A company making tires for bikes is concerned about the exact width of its cyclocross tires. The company has a lower specification limit of 22.8 mm and an upper specification limit of 23.2 mm. The standard deviation is 0.15 mm and the mean is 23 mm. What is the process capability index (Cpk) for the process? Question 2: Consider again that the company making tires for bikes is concerned about the exact width of its cyclocross tires. The company has a lower specification limit of 22.8 mm and an upper specification limit of 23.2 mm. The standard deviation is 0.15 mm and the mean is 23 mm. What is the probability that a tire will either be too wide or too narrow? Question 3: You are working in a small, student-run company that sends out merchandise with university branding to alumni around the world. Every day, you take a sample of 50 shipments that are ready to be shipped to the alumni and inspect them for correctness. Across all days, the average percentage of incorrect…arrow_forwardChart and Regression analysis : What does the intercept predict? X: C16 (number of cars on the sales lot) versus Y: C17 (cars sold per day) Equation: y=2.9x + 14.5 Slope:2.9 Intercept:14.5 Does the intercept mean the intercept is 14.5 means that the cars sold per day( Y) predicted number of cars on sale lot(X) to be 14.5, but this intercept has no meaning. So, I will not use to predict cars sold per day?arrow_forward
- An avant-garde clothing manufacturer runs a series of high-profile, risque ads on a billboard on Highway 101 and regularly collects protest calls from people who are offended by them. The company has no idea how many people in total see the ad, but it has been collecting statistics on the number of phone calls from irate viewers: a) Choose the correct Pareto chart below. O A. Frequency (number) LL WROMI O B. Frequency (number) Type R M W I O Description Offensive racially/ethnically Demeaning to men Demeaning to women Ad is Incomprehensible Other RMWO Frequency (number) LONDO Number of Complaints 12 4 13 2 7 WROMI O Frequency (number) OFONSO 12- RM WIOarrow_forwardErros Pharma Product Performance Appraisal Erros Pharma Products is engaged in the manufacture and distribution of generic and branded medicines for various ailment. It employs more than 450 production employees and 30 sales distribution people. Products are well accepted by the market and physicians patronize the product together with their patients. A performance appraisal has been regularly conducted at six month intervals using the Graphic Rating Scale. The company uses the five point rating scale and the factors evaluated are quality of work, quantity of work and observable factors as initiative, leadership, responsibility and dependability. Two supervisors rate the employees and the average of the two raters becomes the basis for salary evaluation. The department manager reviews the ratings and discusses with the employees the final results given by the supervisors. Three most vocal activists in the company complain directly to the president about the…arrow_forwardWhat is the effectiveness of 3M™Health Information System Division Potentially Preventable readmission method and the Centers for Medicare and Medicaid Services (CMS) used for measuring the quality of care at hospitals? Compare and contrast 3M™Health Information System Division Potentially Preventable readmission method and the Centers for Medicare and Medicaid Services (CMS) method and show how each method interconnects with Hospitals Readmissions Reduction Program (HRRP).arrow_forward
- Could we use surveys with DMA? If that's the case, please provide an example.arrow_forwardAnalyse the issues described below using root cause analysis techniques. A travel agency has recently lost several medium-sized and large corporate customers due to complaints about poor customer service. The management team of the travel agency decided to appoint a team of analysts to address this problem. The team gathered data by conducting interviews and surveys with current and past corporate customers and gathering customer feedback data that the travel agency has recorded over time. About 2% of customers complained about errors made in their bookings. On one occasion, a customer requested a change to a flight booking. The travel agent wrote an e-mail to the customer suggesting that the change had been made and attached a modified travel itinerary. However, it later turned out that the flight reservation system had not confirmed the modified booking. As a result, the customer was not allowed to board the flight, leading to a series of severe inconveniences for the customer.…arrow_forwardProblem 5 Madras Medical College is trying to improve its image providing a positive experience for its patients and their relatives. Part of the "image" program involves providing tasty, inviting patient meals that are also healthful. A questionnaire accompanies each meal served, asking the patient, among other things, whether he or she is satisfied or unsatisfied with the meal. A 100-patient sample of the survey results over the past 7 days yielded the following data: June through December and the MAD and January. The initial the end of December. What can you say about the performance or Day 1 Sample size 100 100 100 100 100 100 100 Construct p-chart that plots the percentage of patients unsatisfied with their meals. Set the control limits to include 99.73% of the random variation in meal satisfaction. Comment on your results. 2 3 4 5 6 7 No. of unsatisfied patients 24 22 8 15 10 26 17arrow_forward
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