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Quality Control : Control Limits and p-Charts

Hunter Nut Company produces cans of mixed nuts, advertised as containing no more than 20% peanuts. Hunter Nut Company wants to establish control limits for their process to ensure meeting this requirement. They have taken 30 samples of 144 cans of nuts from their production process at periodic intervals, inspected each can, and identified the proportion of cans that did not meet the peanut requirement, shown in the Worksheet problem 10. Compute the average proportion nonconforming and the upper and lower control limits for this process. Draw the p-chart and interpret the results.

See the attached files.

All Data may be found in the Excel workbook Statistical Quality Control Problems.xls. Data for each problem are found on a separate worksheet.


Solution Summary

Upper and lower control limits are investigated and p-charts are drawn. The solution is detailed and well presented. The response was given a rating of "5/5" by the student who originally posted the question.