chp15 - Statistical Quality Control FScN 4131 Food Quality...

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Unformatted text preview: Statistical Quality Control FScN 4131 Food Quality November 15, 2000 Benefits of Statistics in Food Quality Control • Provides the tools for a workable and reliable quality system • Reduces appraisal costs • Provides a rapid assessment of the process • Eliminates 100% inspection Statistics Basics: Glossary review • Data • Population • Sample • Random sample • Distribution • Parameters • Statistics Statistics Basics Measures of central tendency 1. Mean (average, arithmetic mean) 2. Median The middle number of a set of data when the numbers are arranged in order of magnitude µ = Σ X N Statistics Basics Measures of dispersion 1. Range Difference between the smallest and the largest numbers of a set of data 2. Variance ( σ 2 ) σ 2 = 3. Standard deviation ( σ ) Σ ( µ-X) 2 N Statistics Estimates of µ and σ from samples 1. X X= 2. Standard error (s) s = Σ (X-X) 2 n-1 X 1 + X 2 + X 3 + X 4 + X 5 +…+ X n n √ Σ X 2- ( Σ X) 2 /n n-1 √ = Statistical Distributions • Binomial • Poisson • Normal • t • F • Chi-square • Others Binomial Distribution • Developed by Jacob Bernoulli (1654-1705) • A two-valued distribution or Zero-One distribution...
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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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chp15 - Statistical Quality Control FScN 4131 Food Quality...

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