Method Selection and sample prep

Question 1

What are the steps in analysis?

Answer 1

1.Types of analysis
2. choice of method
3. Sample selection and prep
4. Analytical techniques
5. Data analysis + interpretation
6. Decision making

Question 2

What 4 things do you need keep in mind when choosing a method

Answer 2

1. Objective of the assay
2. Characteristics of the method
3. Validity of the method
4. Considerations of food composition

Question 3

What can contribute to the greatest overall error in analysis?

Answer 3

Sampling

Question 4

What can limit sample size?

Answer 4

• Time
• Resources
• Logistics and handling
• Data analysis
  *Practicality

Question 5

Define variance

Answer 5

An estimate of uncertainty (represents percision)

Question 6

Define percision

Answer 6

How reproducible the data is

Question 7

Define accuracy

Answer 7

How close the data are to the true value

Question 8

Rank the four factors contributing to errors in food analysis

Answer 8

1. Sampling
2. Homogenization
3. Sample prep
4. Assay procedure

Question 9

What is variable sampling?

Answer 9

Samples collected for quantitative analysis of certain characteristics of a population

Question 10

What is attribute sampling?

Answer 10

Samples collected to determine acceptibility of a sample (results are binary)