11-c and u Charts-class - Edited by Foxit Reader...

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UGA FDST 4090/6090 - (c) W.C. Hurst 2009 1 Attribute Control Charts: William C. Hurst FDST 4090/6090 (2009) Use and Goals for c Chart 1. Measures total number of defects in a given area of opportunity (inspectional unit) of a random sample drawn from an infinite population FDST 4090/6090 © W.C. Hurst 2009 2. 3. Control limits are set based on standard deviation of Poisson probability distribution When do you use a c Chart? A c chart is used FDST 4090/6090 © W.C. Hurst 2009 Calculating a c Chart FDST 4090/6090 © W.C. Hurst 2009 d = number of defects k = number of sample periods c Chart Example • A food service distributor routinely monitors fresh- cut lettuce quality coming from its processors before releasing orders • The contents of each package are examined for these defects: – Core pieces FDST 4090/6090 © W.C. Hurst 2009 going to its individual stores. • Typically, 48 oz (4 lb) packages of garden salad are removed at random from each pallet. – Russet spotting – Bruising SEE WORKSHEET What kind of variation is occurring? • The total number of defects found in 48 oz packages over a six pallet examination period is shown on your worksheet. Determine what type of variation is
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11-c and u Charts-class - Edited by Foxit Reader...

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