Podcast
Questions and Answers
What is the main goal in performing a chemical analysis?
What is the main goal in performing a chemical analysis?
- To measure uncertainties accurately
- To eliminate errors and uncertainties
- To produce a scatter of results
- To estimate the true value with acceptable accuracy (correct)
Why is the true value for any quantity always unknown in chemical analysis?
Why is the true value for any quantity always unknown in chemical analysis?
- Due to the experimenter's fault
- Since measurement uncertainties can never be completely eliminated (correct)
- Because of faulty calibrations or standardization
- Because of the scatter of results
What is the significance of evaluating the magnitude of error in chemical analysis?
What is the significance of evaluating the magnitude of error in chemical analysis?
- To determine the experimenter's fault
- To produce a scatter of accurate results
- To eliminate errors and uncertainties
- To define limits for the true value with a given level of probability (correct)
Why are data of unknown quality considered worthless in chemical analysis?
Why are data of unknown quality considered worthless in chemical analysis?
What is the middle value of a sample of results arranged in order of increasing/decreasing magnitude?
What is the middle value of a sample of results arranged in order of increasing/decreasing magnitude?
Which value is used advantageously when a set of data contains an outlier?
Which value is used advantageously when a set of data contains an outlier?
What does the mode represent in a set of determinations?
What does the mode represent in a set of determinations?
Which term describes the reproducibility of measurements and deals with repeatability and reproducibility?
Which term describes the reproducibility of measurements and deals with repeatability and reproducibility?
What is used to describe how close the results are, provided that they are obtained in exactly the same way?
What is used to describe how close the results are, provided that they are obtained in exactly the same way?
Which measure is calculated by dividing the sum of replicate measurements by the number of measurements in the set?
Which measure is calculated by dividing the sum of replicate measurements by the number of measurements in the set?
What does standard deviation from the mean represent?
What does standard deviation from the mean represent?
What does accuracy indicate about measurements?
What does accuracy indicate about measurements?
"Precision" deals with which type of variability?
"Precision" deals with which type of variability?
"Mode" represents which value in a set of determinations?
"Mode" represents which value in a set of determinations?
What is used to estimate the uncertainty associated with the central value?
What is used to estimate the uncertainty associated with the central value?
