Fundamentals Of Quality Control And Improvement 4th Edition Amitava Mitra - Solutions

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Refer to Exercise 7-52 and the data in Table 7-32 on cardiac surgery patients. Conduct a risk-adjusted sequential probability ratio test using a false-alarm rate of 0.005. Assume that the chance of failing to detect a decrease in the odds ratio of mortality from 1 to 0.6 is 0.05.Exercise 7-52The
For the patient data in Exercise 7-52 as shown in Table 7-32, construct a risk-adjusted exponentially weighted moving average (RAEWMA) chart using a weighting constant of 0.2 and a false-alarm rate of 0.10. Comment on the performance of the surgical team.Exercise 7-52The predicted mortality of
Refer to Exercise 8-36. Set up 2σ control limits. What is the probability of detecting a change in the process average number of dietary errors per 100 trays to 8 on the first sample drawn after the change? Explain under what conditions you would prefer to have these 2σ control limits over the
For Exercise 9-13, find the Cp index. Comment on the ability of the process to meet specifications. What proportion of the specification range is used up by the process? If it is easier to change the process mean than to change its variability, to what value should the process mean be set to
Refer to Exercise 9-33 on the order completion time of a logistics firm. Upon conducting a methods study of the various operations, the firm was able to reduce the mean times of operation 1 to 5.8 hours and that of operation 3 to 7.5 hours. Assume that the tolerances did not change. The customer
Refer to Exercise 12-19. Find a 90% confidence interval for the difference in the mean effectiveness of program 1 and the average of that using programs 2 and 3.Exercise 12-19Three training programs are being considered for auditors in an accounting firm. The success of the training programs is
The predicted mortality of cardiac surgery patients in an intensive care unit, based on their APACHE score, is found based on a logistic regression model applied to patients over a four-year period. Table 7-32 shows the predictive pre-operative mortality for 25 recent patients, along with the
Refer to Exercise 8-32. If the weighting systems were different (i.e., 10, 5, and 1), how would the centerline and the control limits change for the U-chart? Discuss changes, if any, in the inferences made about the process.Exercise 8-32Nonconformities in automobiles fall into three categories:
Consider Exercise 8-38. Determine the sensitivity of the control limits on the complication rate using values of 0.2% and 0.5%.Exercise 8-38A building contractor subcontracts to a local merchant a job involving hanging wallpaper. To have an idea of the quality level of the merchant’s work, the
Mortality data for patients in the intensive care unit (ICU) in a health care facility, collected over 8-hour intervals, are shown in Table 8-34. Since patients have varying risks, the predicted mortality from a logistic regression model that uses the patient’s APACHE score (severity of disease)
In a health care facility, it is known that nosocomial infections are rare. Table 8-35 shows the number of admissions between occurrences of nosocomial infections. Construct an appropriate control chart and comment on the performance of the health care team. TABLE 8-35 Number of Admissions Between
An organization that accepts orders via the Web processes it, and has delivery scheduled based on its inventory levels is known to be proficient in its service. Errors in orders received could be due to the wrong shipment of product, incorrect quantity, or not meeting promised delivery date. Given
A major airline surveys passengers to monitor the satisfaction level of its customers. Even though the airline uses a five-point Likert scale (5: outstanding service; 4: good; 3: average; 2: below average; 1: poor), it wants to monitor the proportion that considers the service level as either
The marketing department of a large organization is interested in being responsive to its customers’ needs. Accordingly, each week it monitors the number of complaints TABLE 8-38 Passenger Satisfaction Survey in Airline Number Checking "Outstanding" or Number Checking "Outstanding"
Compare the capability indices Cpk, Cpm, and Cpmk and discuss what they measure in the process. When would you use Cpq?
Refer to Exercise 9-33 on the order completion time of a logistics firm. Upon conducting a methods study of the various operations, the firm was able to reduce the mean times of operation from 1 to 5.8 hours and that of operation 3 to 7.5 hours. Assume that the tolerances did not change. The
Refer to Exercise 9-42. The investment bank was able to identify a riskier strategy that projects a mean yield of 9.2% with a standard deviation of 2.4%. Assuming normality of distribution of yield rates, what is the lower capability index now if a target goal of 9% is set? In what proportion of
A health care facility in a metropolitan area is interested in the efficiency of its laboratory turnaround time. Based on data collected over last year, the mean turn around time was found to be 55 minutes with a standard deviation of 15 minutes. The facility has set a goal value of 60 minutes.
Refer to Exercise 10-30. What is the average sample number of incoming lots that are 2% nonconforming? What is the average total inspection for this quality level of 2% nonconforming?Exercise 10-30Consider a double sampling plan given by the following parameters: N = 1200, n1 =
An electronic component in a video recorder has an exponential time-to-failure distribution. What is the minimum mean time to failure of the component if it is to have a probability of 0.92 of successful operation after 6000 hours of operation?
An optical sensor has a Weibull time-to-failure distribution with a scale parameter of 300 hours and a shape parameter of 0.5. What is the reliability of the sensor after 500 hours of operation? Find the meantime to failure.
A remote control unit has 40 components in series. The reliability of each component is 0.9994. What is the reliability of the remote control unit? If a redesign has 25 components in series, what is the reliability of the unit?
Four components A, B, C, and D are placed in parallel to make a subassembly in a circuit board. The reliabilities of A, B, C, and D are 0.93, 0.88, 0.95, and 0.92, respectively. Find the reliability of the subassembly A. E F G FIGURE 11-14 System with seven components.
Refer to Exercise 11-27. Find the appropriate plan using Handbook H-108 if failed items are not replaced during the test.Exercise 11-27A time-terminated life testing plan is desired that will accept lots with a mean life of 6000 hours with a probability of 0.99 and will accept lots with a mean life
Refer to Exercise 11-29. If failed items are not replaced during the test, determine the plan using Handbook H-108.Exercise 11-29In a time-terminated life testing plan, it is desired to reject lots with a mean life of 1500 hours with a probability of 0.95 and reject lots with a mean life of 7500
Two groups of samples of patients were randomly selected from a county. The first group (Group 1) had no history of chronic disease while the second group (Group 2) had a positive history. The selected patients were observed for a period of 15 years. Some patients had to leave the study due to
Refer to Exercise 11-31. Test the null hypothesis of equality of the survival functions of the two groups using a level of significance of 0.05.Exercise 11-31Two groups of samples of patients were randomly selected from a county. The first group (Group 1) had no history of chronic disease while the
An information technology company that specializes in website development is interested in modeling development time as a function of the contract cost, number of available developers, and number of projects undertaken.(a) Write down the equation of the model and explain the meaning of the model
Refer to Exercise 13-1. What null hypothesis would you test to determine if contract cost is significant in the presence of the other independent variables? What null hypothesis would you test to determine if the number of projects undertaken could be dropped from the model?Exercise 13-1An
A financial institution wants to explore the relationship between a loan application approval time and the independent variables of the annual salary of the applicant and years of employment.What is the equation of a regression model?In order to satisfy governmental regulations, the institution
A marketing company wants to determine if the combined years of experience of its staff who worked on a proposal have an impact on the chance of winning a contract. What is the equation of an appropriate model?
A health care facility is exploring the relationship between annual costs based on the number of patients seen and the number of emergency cases.Explain what an outlier means in this context. How would you statistically test for the presence of an outlier?In this context, what do you do if you find
You are interested in developing a regression model to predict monthly sales of a departmental store. Discuss the independent variables that you might select. How would you select the functional form for these independent variables?
A retail company has information on the time taken (in days) to fulfill an order, the value of the order (in $10,000), the number of different types of products in the order, and the store location. The data are shown in Tables 13-8.Table in 13.8Find a simple regression model that predicts the time
Refer to the data in Table 13-9 on diabetic patients and the development of retinopathy.(a) Develop a regression model to predict the probability of development of retinopathy based on years of diabetes and gender of the person. Is the model significant at α = 0.05?(b) Is the model developed in
Refer to the data in Table 13-8 on order fulfillment time.Table 13-8You decide to develop a regression model using order value and the number of products in the order as predictors. Find the model equation. Is it significant at = 0.05?Find R2 and R2a and comment relative to the model in Exercise
Refer to the data in Table 13-8 on order fulfillment time.Table 13-8 You decide to develop a regression model using order value, the number of products, and the location of the retailer as predictors. Find the model equation. Is it significant at α = 0.05?What is R2 and interpret its value
Refer to the data in Table 13-6 on obesity, gender, and occurrence of a heart attack.(a) Develop a regression model to predict the chance of a heart attack based on weight. Interpret the model coefficients.(b) Is the model significant using α = 0.05?(c) Find a 95% confidence interval for the mean
Table 13-9 shows data on diabetic patients and the development of retinopathy. The gender of the person, the number of years that the person has been diagnosed with diabetes (labeled as Years), and whether the person has developed retinopathy (Y = Yes; N = No) are shown in the table.(a) Fit an
Refer to Exercise 7-49. Construct an exponentially weighted moving-average chart using a weighting constant of 0.2 for the weekly amount invested. Comment on the process. If it is desired to have a goal value of $1.5M for the standard deviation, using the constructed chart, comment on the ability
Refer to Exercise 7-49 and the revised process. Is this process capable of meeting a goal value of $1.5M for the standard deviation of the weekly amount invested? Construct an appropriate chart and discuss.Exercise 7-49An investment bank is interested in monitoring the weekly amount (in millions of
An investment bank is interested in monitoring the weekly amount (in millions of dollars) invested in volatile stocks so as to maintain a stable rate of return on a selected fund. Table 731 shows 25 consecutive weeks of the amount invested ($M) in the fund. Construct appropriate control charts and
Refer to Exercise 7-46. Construct an exponentially weighted moving-average chart using a weighting constant of 0.2 for the decision-making process and comment. Is the existing process capable of meeting a goal value of 12 weeks?Exercise 7-46The time to evaluate and make a decision on mortgage loan
Refer to Exercise 7-46. Demonstrate if the existing process in making a decision on loan applications is capable of meeting a goal value of 12 weeks. Assuming a normal distribution of the decision-making time, what proportion of the applications will not meet this goal value?Exercise 7-46The time
The time to evaluate and make a decision on mortgage loan applications is being examined in a financial institution. Twenty-five mortgage applications are selected from the previous month and the decision-making times, in days, are shown in Table 7-30. Construct an appropriate control chart and
Lung congestion may occur in illness among infants. However, it is not easily verifiable without radiography. To monitor an ill infant to predict whether lung opacity will occur on a radiograph, data are kept on age, respiration rate, heart rate, temperature, and pulse oximetry. Target values for
The time from product inception and design to marketing and sales is important for application software on mobile devices. For the last 20 products, Table 7-26 shows such times (in weeks) for a software organization. Construct an appropriate control chart and comment on the organization’s
Consider the five items on the timeliness of operations as listed in Table 5-7. A summary of the survey responses on patient satisfaction for each item, by the percentage in each rating category, is shown in Table 5-15. Construct a stacked bar chart and discuss the resultsTable 5-7 TABLE 5-7
The turnaround time (TAT) for a certain blood test in a laboratory in a health care facility is of interest. The mean and standard deviation of a random sample of 100 such tests are found to be 120 minutes and 20 minutes, respectively. Find the 3σ control limits for the individual turnaround test
Explain some causes that would make the control chart pattern follow a gradually increasing trend.
What are some reasons for a process to go out of control due to a sudden shift in the level?
What are the benefits of using control charts?
Consider Table 5-15 on the summary of patient satisfaction ratings. The percentages in each rating category are based on a response from a total of 200 patients from a prior year. For the item waiting time prior to being seen by a physician, consider the combined proportion of patients who are
Management is exploring the possibility of adding more agents at the check-in counter of an airline to reduce the waiting time of customers. Based on available information, the standard deviation of the waiting times is approximately 5.2 minutes. If manage ment wants to estimate the mean waiting
Summary data on ratings of patient satisfaction and importance for the survey item “waiting time prior to being seen by a physician” is shown in Table 5-16 for a total of 400 patients. Perceived satisfaction was rated on a Likert scale from 1 to 5, while importance was also rated on a Likert
Consider Table 5-15 on the summary of patient satisfaction ratings on survey items related to timeliness of operations. Suppose the percentages are based on a responsefrom a total of 200 patients. Regarding the item on timeliness of nurse visits, can we conclude that the proportion of responses in
Refer to Table 5-7 and the patient satisfaction survey form with 22 items. Patients were asked to rate their perceived level of satisfaction on a five-point ordinal Likert scale as shown. Additionally, patients were asked to rate the importance of each item on a five-point ordinal Likert scale,
Explain why it is important to obtain feedback from customers on both perceived satisfaction and the importance of specified survey items.
A fast-food restaurant in an urban area experiences a higher traffic rate during the early morning and lunch hours. In order to conduct a customer satisfaction survey, discuss possible sampling procedures.
A financial institution is contemplating the offering of three different types of savings accounts. It selects 100 customers randomly and obtains a response on which account each person would select. What statistical test would you use to determine if customers have a preference for any account?
Data from a survey of customers are on an ordinal scale (1–7) regarding satisfaction with the services provided in a bank by three tellers. If we wish to determine if the degree of customer satisfaction is independent of the teller, what statistical test should be used?
A county wishes to estimate the average income of people, where it is known that income levels vary quite a bit among the residents in sections of the county. What type of sampling scheme should be used?
The number of times a Web server is accessed per minute is known to follow a Poisson distribution. A random sample of size 8, each over a minute, shows the number of times that the server is accessed as follows: 5, 3, 2, 0, 6, 1, 1, 2. Find a 90% confidence for the mean number of times that the Web
Find an expression for the probability of the union of three events that are mutually independent of each other.
Use a flow chart to develop an advertising campaign for a new product that you will present to top management.
Discuss the challenges and the contributions that could be derived from the development of a healthcare decision support system in the current century.
Discuss the importance of health care analytics and its possible contributions.
What are some of the challenges faced by the healthcare industry in the twenty-first century?
Consider Exercise3-23. Suppose, through a quality improvement effort, that the first-pass yield of each operation is improved to 98%. What is the percentage improvement in rolled throughput yield?Exercise3-23A product goes through 20 independent operations. For each operation, the first pass yield
A product goes through 20 independent operations. For each operation, the first pass yield is 95%. What is the rolled throughput yield for the process?
Consider a visit to your local physician’s office for a routine procedure. Develop a flow chart for the process. What methods could be implemented to improve your satisfaction and reduce waiting time?
What is the purpose of vendor certification? Describe typical phases of certification.
In the context of a healthcare organization, explain why it is important to know not only the needs of the customers but also their relative importance.
Customer satisfaction is of importance to management. Discuss customer needs in the context of internet service providers(ISPs) and their degree of importance.
Discuss the organizational structure in a typical health care facility. What barriers might this create and what are some remedial measures?
For a regional hospital in a metropolitan area, what are some of the internal failure and external failure costs? How might the y be reduced?
Classify each of the following into the cost categories of prevention, appraisal, internal failure and external failure:(a) Vendor selection(b) Administrative salaries(c) Downgraded product(d) Setup for inspection(e) Supplier control(f) Externalcertification(g) Gagecalibration(h) Processaudit

Fundamentals Of Quality Control And Improvement 4th Edition Amitava Mitra - Solutions

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