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...
See AnswerQ: 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...
See AnswerQ: 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...
See AnswerQ: 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? (...
See AnswerQ: 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...
See AnswerQ: 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...
See AnswerQ: 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...
See AnswerQ: 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?
See AnswerQ: 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...
See AnswerQ: 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...
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