Podcast
Questions and Answers
What is the main reason for analyzing replicates in an analytical procedure?
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?
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?
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?
What does the mean represent in a set of replicate measurements?
Why is it important to justify the extra effort required to analyze replicates in an analytical procedure?
Why is it important to justify the extra effort required to analyze replicates in an analytical procedure?
How do we determine the median when there is an even number of results?
How do we determine the median when there is an even number of results?
What does precision in measurements refer to?
What does precision in measurements refer to?
How is accuracy different from precision?
How is accuracy different from precision?
What type of error causes data to be scattered around a mean value?
What type of error causes data to be scattered around a mean value?
Which type of error causes the mean of a data set to differ from the accepted value?
Which type of error causes the mean of a data set to differ from the accepted value?
What is a common source of systematic errors related to measuring devices?
What is a common source of systematic errors related to measuring devices?
Which type of error is characterized by being constant or proportional?
Which type of error is characterized by being constant or proportional?
'Indeterminate error' is also known as what type of error?
'Indeterminate error' is also known as what type of error?
'Absolute or relative error' is used to express which measure related to experimental data?
'Absolute or relative error' is used to express which measure related to experimental data?
'Personal errors' often arise in measurements that require what kind of judgments?
'Personal errors' often arise in measurements that require what kind of judgments?
What do systematic method errors often result from in chemical analyses?
What do systematic method errors often result from in chemical analyses?
