The thickness of a printed circuit board is an impor- tant quality parameter. Data on board thickness (in inches) are given in Table 6E.5 for 25 samples of three boards each. (a) Set up ī and R control charts. Is the process in statistical control? (b) Estimate the process standard deviation. (c) What are the limits that you would expect to con- tain nearly all the process measurements? (d) If the specifications are at 0.0630 in. ±0.0015 in., what is the value of the PCR C,?

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- TABLE 6E.5
Printed Circuit Board Thickness for
Exercise 6.10
Sample
Number
X2
X3
0.0629
0.0636
0.0640
0.0630
0.0631
0.0622
3
0.0628
0.0631
0.0633
4
0.0634
0.0630
0.0631
5
0.0619
0.0628
0.0630
6
0.0613
0.0629
0.0634
7
0.0630
0.0639
0.0625
8
0.0628
0.0627
0.0622
0.0623
0.0626
0.0633
10
0.0631
0.0631
0.0633
11
0.0635
0.0630
0.0638
12
0.0623
0.0630
0.0630
13
0.0635
0.0631
0.0630
14
0.0645
0.0640
0.0631
15
0.0619
0.0644
0.0632
16
0.0631
0.0627
0.0630
17
0.0616
0.0623
0.0631
18
0.0630
0.0630
0.0626
19
0.0636
0.0631
0.0629
20
0.0640
0.0635
0.0629
21
0.0628
0.0625 0.0616
22
0.0615
0.0625
0.0619
23
0.0630
0.0632
0.0630
24
0.0635
0.0629
0.0635
25
0.0623
0.0629
0.0630
Transcribed Image Text:- TABLE 6E.5 Printed Circuit Board Thickness for Exercise 6.10 Sample Number X2 X3 0.0629 0.0636 0.0640 0.0630 0.0631 0.0622 3 0.0628 0.0631 0.0633 4 0.0634 0.0630 0.0631 5 0.0619 0.0628 0.0630 6 0.0613 0.0629 0.0634 7 0.0630 0.0639 0.0625 8 0.0628 0.0627 0.0622 0.0623 0.0626 0.0633 10 0.0631 0.0631 0.0633 11 0.0635 0.0630 0.0638 12 0.0623 0.0630 0.0630 13 0.0635 0.0631 0.0630 14 0.0645 0.0640 0.0631 15 0.0619 0.0644 0.0632 16 0.0631 0.0627 0.0630 17 0.0616 0.0623 0.0631 18 0.0630 0.0630 0.0626 19 0.0636 0.0631 0.0629 20 0.0640 0.0635 0.0629 21 0.0628 0.0625 0.0616 22 0.0615 0.0625 0.0619 23 0.0630 0.0632 0.0630 24 0.0635 0.0629 0.0635 25 0.0623 0.0629 0.0630
6.10. The thickness of a printed circuit board is an impor-
tant quality parameter. Data on board thickness (in
inches) are given in Table 6E.5 for 25 samples of
three boards each.
(a) Set up ī and R control charts. Is the process in
statistical control?
(b) Estimate the process standard deviation.
(c) What are the limits that you would expect to con-
tain nearly all the process measurements?
(d) If the specifications are at 0.0630 in. ±0.0015 in.,
what is the value of the PCR C,?
Transcribed Image Text:6.10. The thickness of a printed circuit board is an impor- tant quality parameter. Data on board thickness (in inches) are given in Table 6E.5 for 25 samples of three boards each. (a) Set up ī and R control charts. Is the process in statistical control? (b) Estimate the process standard deviation. (c) What are the limits that you would expect to con- tain nearly all the process measurements? (d) If the specifications are at 0.0630 in. ±0.0015 in., what is the value of the PCR C,?
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