chp18 - Sampling Plans Critical factors: Sampling FScN 4131...

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Sampling FScN 4131 Food Quality November 22, 2000 Sampling Plans Critical factors: 1. Lot homogeneity: sampling point 2. Sampling procedure 3. Sampling frequency 4. Sample size Sample Size •R equ i r em en t s : 1. Large enough to represent the population 2. Small enough to be economically feasible Sample Size: Policies 1. Sample size of zero 2. 100% sampling 3. Spot checking 4. Constant percentage, square root 5. Statistical samples Sample Size: Policies 1. Sample size of zero – Recommended by some quality systems – Mostly for ingredients (suppliers responsibility) – Not for finished product Sample Size: Policies 2. 100% sampling – Not normally cost-effective – Performed by automatic devices – Examples: weighing devices, electric eyes, metal detectors, etc.
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Sample Size: Policies 3. Spot checking – Defined as: infrequent, nonscheduled extra examination – A “check on the checks” – Should not be confused as an audit – Frequently conducted by supervisors to check on the operators performance – Has no statistical basis Sample Size: Policies 4. Constant percentage, square root – “Shortcuts” to statistical determination, but no statistical validity – Percentage determined arbitrarily – Suitable in cases of high homogeneity – Square root of lot size –Examp les ?
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This note was uploaded on 01/06/2011 for the course FDE 510 taught by Professor Prof.hamialpas during the Spring '09 term at Middle East Technical University.

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chp18 - Sampling Plans Critical factors: Sampling FScN 4131...

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