The number of nonconforming switches in samples of size 150 is shown in Table 6E.2. Construct a fraction nonconforming control chart for these data. Does the process appear to be in control? If not, assume that assignable cause can be found for all points outside the control limits, and calculate the revised control limits.

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Number of Nonconiorming Switches Number of Nonconforming Switches Sample mple Number Numbeir 12 13 14 15 16 17 15 10 19 10 20