16 Questions
What is the main reason for analyzing replicates in an analytical procedure?
To improve reliability and estimate uncertainty
Which term refers to the most widely used measure of central value in a set of replicate measurements?
Mean
How is the median calculated when there is an odd number of results?
By arranging in order and choosing the middle result
What does the mean represent in a set of replicate measurements?
The central value obtained by division
Why is it important to justify the extra effort required to analyze replicates in an analytical procedure?
To estimate uncertainty and improve reliability
How do we determine the median when there is an even number of results?
Choosing the average value of the middle pair
What does precision in measurements refer to?
The reproducibility of measurements taken in the same way
How is accuracy different from precision?
Accuracy indicates closeness to the true or accepted value.
What type of error causes data to be scattered around a mean value?
Random error
Which type of error causes the mean of a data set to differ from the accepted value?
Systematic error
What is a common source of systematic errors related to measuring devices?
Instrumental errors
Which type of error is characterized by being constant or proportional?
'Systematic errors'
'Indeterminate error' is also known as what type of error?
'Random error'
'Absolute or relative error' is used to express which measure related to experimental data?
'Accuracy'
'Personal errors' often arise in measurements that require what kind of judgments?
'Personal judgments'
What do systematic method errors often result from in chemical analyses?
Slowness and incompleteness of reactions
Learn about the importance of obtaining precise and accurate results in analytical procedures by analyzing replicates of samples. Understand how to determine the central value of a set of measurements and its significance in obtaining reliable information.
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