FST109 HWK 6

FST109 HWK 6 - Question #1 a. Yes, it's a good fit because...

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Question #1 a. Yes, it’s a good fit because adjusted R^2 is greater than .90. (see attach for quadratic model) b. pH and pH ^2 c. Y= 0.66+ 0.378(pH)-0.017(pH^2) d. Y=0.66+0.387(10) -0.017(100) = 2.69 Residual = experiment – predicted 2.76 – 2.69 = .07 e. See attach for response surface. Question #2 a. b. c.
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d. e. f. Question #3 1. CFU = Colony Forming Units 2. Microbial sampling is not used as HACCP critical control point because it is too costly and test is not available, and no scientific validity. 3. We use CFU/Cm2 when we are counting the surface area of the contamination. 4. a. It is too expensive to test for each organism individually, indicator is cheaper
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b. It takes too long for food industry to test for each organism so indicator is faster test. c. The indicator organism is usually the main problem for food industries 5. 1.0x10^2 CFU/g and 1.0x10^3 CFU/g 6. FDA considers pathogen as adulteration in ready-to-eat food is because pathogen can be poisonous or deleterious that can cause injuries to health to consumer that eats the food, which is under the definition of adulteration in FDA rules. 7. The advantage of pooling is that you can get a good estimate of how many bacteria there is. It is also very cost efficient and save money for labs testing for microorganisms. 8. Pooling samples can potentially hide variances and give false confidence concerning the data significance. It is also giving you an estimate, so its not 100% accurate compare to testing one at a time. Question #4
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FST109 HWK 6 - Question #1 a. Yes, it's a good fit because...

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