Questions and Answers of Fundamentals Of Quality Control And Improvement

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
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
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
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
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
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
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.
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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.
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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.
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.
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
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.
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
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
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
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
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
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