Questions and Answers of Fundamentals Of Quality Control

The director of a pharmacy department is interested in benchmarking the level of operations in the unit.The director has definedmedication errors as being anyoneof the following: wrongmedication;
Nonconformities in automobiles fall into three categories: serious, major, and minor.Twenty-five samples of five automobiles are chosen, and the total number of nonconformities in each category is
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 theU-chart? Discuss changes, if any, in the inferences
Refer to Exercise 8-18. Construct an OC curve for the p-chart. If the process proportion of dissatisfied customers were to rise to 7%, what is the probability of not detecting this shift on the first
Refer to Exercise 8-27. Construct an OC curve for the c-chart. If the process average number of dietary errors per 100 trays increases to 10, what is the probability of detecting this on the first
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
The number of heart surgery complications is rare. To monitor the effectiveness of such surgeries, data are recorded on the number of such procedures until a complication occurs. These complications
shows such data for a sequence of 25 complications. It is estimated from past data that the complication rate is 0.1%. Construct an appropriate control chart and comment on the process assuming a
Consider Exercise 8-38. If you were interested in detecting an improvement in the process using a one-sided limit, what should the minimum sample size be for an α of 0.005? What should it be for an
Consider Exercise 8-38 under the assumption that the complication rate is 0.1%. If you were to construct a p-chart using two-sided 3σ limits, what would the minimum sample size be to detect an
Consider Exercise 8-38. Determine the sensitivity of the control limits on the complication rate using values of 0.2% and 0.5%.
Consider Exercise 8-38 under the assumption that the complication rate is 0.1% and a type I error of 0.005. If you reduced the upper control limit to half of its previous value, what type of process
In a health care facility, it is known that nosocomial infections are rare. Table 8-38 shows the number of admissions between occurrences of nosocomial infections.Construct an appropriate control
Data from a city bank showing monthly loan applications for home mortgage and the number rejected are given in Table 8-39. Construct an appropriate control chart and comment on the loan approval
Refer to Exercise 9-13. Find the process capability indexCpk and comment on process performance. If the target value is 47.5 ppm, find the Cpm and Cpmk indices and comment on their values. If the
Consider the assembly of three components shown in Figure 9-22. The tolerances for these three components are given in Table 9-8. Assume that the tolerances on the components are independent of each
Refer to the four-component assembly shown in Figure 9-14. Assume that the length of each component is normally and independently distributed with the means shown in Table 9-9. The specifications for
Refer to Exercise 9-24. Suppose that the specifications for the assembly length are 35± 0.3 cm and that the tolerances ofAand C are equal but those for B andDare each twice as large as that for A.
Consider Figure 9-16, which shows the assembly of a shaft in a bearing. The specifications for the shaft diameter are 6± 0.06 cm, and those for the hole diameter are 6.2± 0.03 cm.(a) Find the
A cylindrical piece is used in an assembly in which the weight is to be controlled. The tolerances on diameter and height, on the basis of five observations, are 2 ±0.06 cmand 6 ±0.06 cm,
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
An investment bank has been monitoring its return on investment for a certain category of its shareholders. Past data show a mean yield of 7.5% with a standard deviation of 1.5%. Assuming normality
Refer to Exercise 9-42. With the adoption of a slightly more conservative investment strategy, the bank forecasts a mean yield of 7.0% with a standard deviation of 0.9%.Assuming normality of
Refer to Exercise 9-43 on the investment bank. Using the investment strategy that yields a mean yield of 7.0% with a standard deviation of 0.9%, what should a published goal of yield for customers be
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
For a marketing manager of a company, product sales in a specified market is of importance. Currently, for a brand-named product, the mean monthly sales is $50,000 with a standard deviation of $3500.
Refer to Exercise 9-46. In order to boost product sales, the manager is contemplating the hiring of an additional sales staff. The added monthly cost of this hire will be$6000, but the expected
Refer to Exercise 9-48. The quality improvement team, after a thorough study of the existing processes, recommended some procedural changes. Data collected after the changes yielded a mean turnaround
Refer to Exercise 9-49 on the laboratory turnaround time data. The facility wanted to compare its updated performance to another metropolitan facility serving the needs of similar patients. The other
Consider the seven-component system shown in Figure 10-14. The reliabilities of the components are as follows: RA= 0.96, RB= 0.92, RC =0.94, RD= 0.89, RE= 0.95, RF=0.88, RG=0.90. Find the reliability
Refer to Exercise 10-13 and the system shown in Figure 10-14. Suppose that component B is a standby component. Find the reliability of the system after 1000 hours. What is the mean time to failure?
Refer to Exercise 10-25. If failed items are replaced with similar items, determine a life testing plan using Handbook H-108.
Refer to Exercise 10-27. Find the appropriate plan using Handbook H-108 if failed items are not replaced during the test.
Refer to Exercise 10-29. If failed items are not replaced during the test, determine the plan using Handbook H-108.
Refer to Exercise 10-31. Test the null hypothesis of equality of the survival functions of the two groups using a level of significance of 0.05.

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