2.1. True Value vs Measured Value

Try these first

1. 1.

   Define true value.

   Hint

   Think about the ideal or perfect measurement.

2. 2.

   What is the role of standards in measurements?

   Hint

   Standards are a basis for accuracy.

3. 3.

   What is the true value?

   • A) The displayed value
   • B) The actual value we aim to measure
   • C) The average of multiple readings

   Hint

   Think about what you would consider 'correct'.

4. 4.

   Standards are used for which of the following?

   • True
   • False

   Hint

   Standards help in verifying accuracy.

5. 5.

   A laboratory is consistently receiving a measurement of a pollutant as 20 ppm when using their current calibration. However, a re-evaluation shows inaccurately calibrated instruments were used, leading to a double-check against verified standards. How should the lab proceed?

   Hint

   Think about the steps involved in ensuring reliability once error is discovered.

6. 6.

   Consider a scenario where a measuring instrument is calibrated to a known standard, showing consistency over time. However, after one month, the same instrument begins returning divergent values. What strategies can the laboratory employ?

   Hint

   Consider environmental factors that might affect instrument performance.