Questions and Answers of Fundamentals Of Quality Control

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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