Questions from Total Quality Management

Q: The emergency service unit in a hospital has a goal of 3

The emergency service unit in a hospital has a goal of 3.5 minutes for the waiting time of patients before being treated. A random sample of 20 patients is chosen and the sample average waiting time i...

Q: Refer to Exercise 9-13. Find the process capability index

Refer to Exercise 9-13. Find the process capability index Cpk 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 pro...

Q: The diameter of a forged part has specifications of 120± 5

The diameter of a forged part has specifications of 120± 5 mm. A sample of 25 parts chosen from the process gives a sample mean of 122 mm with a sample standard deviation of 2 mm. (a) Find the Cpk ind...

Q: The waiting time in minutes before being served in a local post

The waiting time in minutes before being served in a local post office is observed for 50 randomly chosen customers: (a) Test for normality using α= 0.05. What inferences can you draw? (...

Q: The amount of a preservative added to dairy products should not exceed

The amount of a preservative added to dairy products should not exceed certain levels of 23 ±6 mg (set by the Food and Drug Administration). Samples of size 5 of processed cheese produce...

Q: Consider the assembly of three components shown in Figure 9-19

Consider the assembly of three components shown in Figure 9-19. The tolerances for these three components are given in Table 9-7. Assume that the tolerances on the components are independent of each o...

Q: In Exercise 9-22, suppose that the specifications for the

In Exercise 9-22, suppose that the specifications for the gap are 1.05± 0.15 cm. An assembly with a gap exceeding the upper specification limit is scrapped, whereas that with a gap less...

Q: What are the advantages and disadvantages of using variables rather than attributes

What are the advantages and disadvantages of using variables rather than attributes in control charts?

Q: Refer to the four-component assembly shown in Figure 9-

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 9-8. The specifications for...

Q: Refer to Exercise 9-24. Suppose that 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 of A and C are equal but those for B and D are each twice as large...