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Precision and Accuracy in Analytical Procedures

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Precision and Accuracy in Analytical Procedures

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Questions and Answers

What is the main reason for analyzing replicates in an analytical procedure?

To obtain the exact same individual results

To decrease the central value

To increase the variability of results

To improve reliability and estimate uncertainty (correct)

Which term refers to the most widely used measure of central value in a set of replicate measurements?

Mean (correct)

Mode

Range

Median

How is the median calculated when there is an odd number of results?

By summing all results and dividing by the number of results

By arranging in order and choosing the middle result (correct)

By taking the average of the middle pair

By finding the result with maximum value

What does the mean represent in a set of replicate measurements?

The central value obtained by division Signup and view all the answers

Why is it important to justify the extra effort required to analyze replicates in an analytical procedure?

To estimate uncertainty and improve reliability Signup and view all the answers

How do we determine the median when there is an even number of results?

Choosing the average value of the middle pair Signup and view all the answers

What does precision in measurements refer to?

The reproducibility of measurements taken in the same way Signup and view all the answers

How is accuracy different from precision?

Accuracy indicates closeness to the true or accepted value. Signup and view all the answers

What type of error causes data to be scattered around a mean value?

Random error Signup and view all the answers

Which type of error causes the mean of a data set to differ from the accepted value?

Systematic error Signup and view all the answers

What is a common source of systematic errors related to measuring devices?

Instrumental errors Signup and view all the answers

Which type of error is characterized by being constant or proportional?

'Systematic errors' Signup and view all the answers

'Indeterminate error' is also known as what type of error?

'Random error' Signup and view all the answers

'Absolute or relative error' is used to express which measure related to experimental data?

'Accuracy' Signup and view all the answers

'Personal errors' often arise in measurements that require what kind of judgments?

'Personal judgments' Signup and view all the answers

What do systematic method errors often result from in chemical analyses?

Slowness and incompleteness of reactions Signup and view all the answers