Measurement Error in Analytical Instruments
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Measurement Error in Analytical Instruments

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Questions and Answers

What is the primary purpose of calibration?

  • To ensure the repeatability of the measurement instrument
  • To ensure the accuracy of the measurement instrument (correct)
  • To ensure the reliability of the measurement instrument
  • To ensure the precision of the measurement instrument

    • What is the primary purpose of standardization?

  • To ensure the precision of the measurement instrument
  • To ensure the reliability of the measurement instrument
  • To ensure the repeatability of the measurement instrument
  • To ensure the accuracy of the measurement instrument (correct)

    • What is a common source of sampling error that can lead to significant errors?

  • Contamination of samples during or after their collection (correct)
  • Improper storage of samples
  • Incorrect labeling of samples
  • Biased or nonrepresentative sampling

    • What is the main purpose of validation in analytical procedures?

    <p>To ensure the accuracy of the procedure</p> Signup and view all the answers

    Which measure of central tendency is the middle value when data are ordered from smallest to largest?

    <p>Median</p> Signup and view all the answers

    What is one advantage of using the median over the mean as a measure of central tendency?

    <p>The median is less affected by outliers</p> Signup and view all the answers

    What is the definition of precision in measurements?

    <p>A measure of the spread of data about a central value</p> Signup and view all the answers

    Which type of error is a determinate error whose value depends on the amount of sample analyzed?

    <p>Proportional determinate error</p> Signup and view all the answers

    What is reproducibility defined as in terms of precision?

    <p>Precision obtained under any other set of conditions</p> Signup and view all the answers

    Which type of error causes some measurements or results to be too high while others are too low?

    <p>Intermediate error</p> Signup and view all the answers

    What does repeatability refer to in the context of precision?

    <p>Precision obtained when all measurements are made by the same analyst, using the same solutions and equipment</p> Signup and view all the answers

    How can the effect of indeterminate error be minimized?

    <p>By knowing the sources and relative magnitudes of the error</p> Signup and view all the answers

    What is the primary cause of measurement error?

    <p>Limitations in the equipment and instruments used</p> Signup and view all the answers

    How do manufacturers typically report measurement error for their equipment?

    <p>As a range within which the true value lies</p> Signup and view all the answers

    Which of the following is an example of a personal error?

    <p>Consistently overestimating or underestimating instrument readings</p> Signup and view all the answers

    What is the main challenge in identifying determinate errors?

    <p>Lack of knowledge about the true value of the analysis</p> Signup and view all the answers

    Which of the following is NOT listed as an example of personal error in the text?

    <p>Using an analytical instrument with a known error range</p> Signup and view all the answers

    What is the purpose of providing a tolerance or error range for analytical equipment?

    <p>To indicate the maximum possible error in the measurement</p> Signup and view all the answers

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