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P-chart example

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A p-chart has been developed for a particular item. In the past, 3% of such items have been found to be defective. If a sample of 100 is taken, and 9 of these are found to be defective, should the process be considered out of control? Explain

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In general, it should be considered out of control, because 9% is way greater than 3% (normally, if you are within plus/minus 1 or 2%, that would be acceptable, but here you are 6% off the standard). Unless your this product is known for great ...