The thickness of a printed circuit board is an important quality parameter. Data on board thickness...

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  1. The thickness of a printed circuit board is an importantquality parameter. Data on board thickness (in inches) are given inTable 6 for 25 samples of three boards each.
    (a) Set up x-bar and R control charts. Is the process instatistical control?
    (b) Estimate the process standard deviation.
    (c) What are the limits that you would expect to contain nearly allthe process measurements?
    (d) If the specifications are at 0.0630 in. ± 0.0015 in.,
    what is the value of the PCRCp?     

                                Table 6

    Sample No.      X1                 X2             X3

    1                        0.0629      0.0636       0.0640

    2                        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     0.0623                  

    9                        0.0623     0.0627      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

Answer & Explanation Solved by verified expert
4.1 Ratings (666 Votes)
a Set up xbar and R control charts Is the processin statistical controlThe Xbar and Rchart are obtained in the following stepsStep 1 Calculate the sample average and range for each sampleSample    See Answer
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