IET 3339, Basic Statistics

1. If each sample taken has 500 units, and the average proportion nonconforming is 0.034, what is the upper and lower control limits for the p-chart?

2. If you sample 450 parts per day from a daily production of 12,000 parts, what is the upper and lower control limits of an np chart if the average percentage of good parts is 97.5%?

3. If you inspect 50 automobile windshields and find 266 nonconformities, determine the upper and lower control limits for the c-charts.

Chapter 9

4. If c = 4, determine the sampling plan that will provide the Producer’s Risk protection based on a process avererage of 1.1% nonconforming, and assurance that the lot will be rejected 5% of the time.
C = 4 n = _____

5. If c = 2, determine the sampling plan that will provide Consumer’s Risk protection based on a process average of 2.8% nonconforming, and assurance the lot will be accepted 10% of the time.
C=2 n= _____

Posted Date: 4/17/2012 11:38:02 PM | Location : United States

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