8.2.2. Definition of Accuracy

Try these first

1. 1.

   Define accuracy in your own words.

   Hint

   Think about what you mean when you say a measurement is 'correct'.

2. 2.

   What is the detection limit?

   Hint

   Consider how instruments may be limited in sensitivity.

3. 3.

   What does 'accuracy' refer to in measurement?

   • A. Consistency of results
   • B. Closeness to true value
   • C. The lowest detectable concentration

   Hint

   Think of what it means for a measurement to be 'correct'.

4. 4.

   True or False: Precision ensures that results are always accurate.

   • True
   • False

   Hint

   Consider if consistently wrong measurements can be precise.

5. 5.

   A water sample is analyzed using two different instruments, yielding the following results: Instrument A measures 2 mg/L, while Instrument B measures 3 mg/L. If the true value is known to be 2.5 mg/L, discuss the accuracy and precision of both results.

   Hint

   Compare how close both instruments are to the true value.

6. 6.

   An environmental study requires detection of a toxic substance present at 0.05 mg/L. Instrument C has a detection limit of 0.1 mg/L. Discuss the implications of using this instrument for the study.

   Hint

   Reflect on the importance of instrument sensitivity in environmental assessments.