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A hospital manager has been checking junior doctor records to assess how many errors have been made in patient diagnosis. Of 500 records examined. 25 have some errors. Calculate the upper and lower p-chart control limits for 99.73% confidence.
The hospital manager takes a second sample of 500 patient records. In this case, 30 have an error. What is the maximum percentage of errors that any further sample could have based on p-chart control limits for 99.73% confidence?

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