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Laboratory Manual Precision and Accuracy Concepts

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Laboratory Manual Precision and Accuracy Concepts

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Questions and Answers

Which of the following is NOT a measure typically used to quantify precision?

Standard deviation

Coefficient of variation

Mean concentration (correct)

Standard error

How is precision determined in the context of food sample analysis?

By comparing results to reference standards

By analyzing a single food sample

By analyzing a range of concentrations in food samples (correct)

By analyzing only one type of interfering material

What does precision refer to in the context of replicate observations?

The accuracy of the measurements taken

The number of samples tested

The variability of replicate observations (correct)

The concentration levels of the samples

What is required before collecting data on precision in the laboratory setting?

Familiarity with the method and a reproducible standard curve Signup and view all the answers

In a precision study, why should at least 2 hours of normal laboratory operation be covered?

To account for changes in instrument conditions Signup and view all the answers

What is one of the requirements for a precision study regarding concentration levels?

Studying three separate concentration levels Signup and view all the answers

How many replicate determinations should be made at each concentration level in a precision study?

Seven Signup and view all the answers

Which of the following determines how precise a measurement is?

Variability in replicate observations Signup and view all the answers

What is characteristic of precision in measurements?

Constant variability in repeated measurements. Signup and view all the answers

What role does precision play in determining measurement quality?

Affecting the reproducibility and reliability of measurements. Signup and view all the answers