8.2. Accuracy vs Precision

Try these first

1. 1.

   Define accuracy in your own words.

   Hint

   Think of how close you can hit a target.

2. 2.

   What does precision refer to?

   Hint

   Consider how consistent your results are.

3. 3.

   What defines accuracy in measurements?

   • Consistency of measurements
   • Closeness to the true value
   • Average of repeated measures

   Hint

   Think about hitting a bullseye.

4. 4.

   True or False: Precision measures the consistency of measurements.

   • True
   • False

   Hint

   Consider if you shot arrows at the same target repeatedly.

5. 5.

   You measure a sample three times and get the following results: 20.1, 20.2, and 19.9 mg/L. Analyze these results for precision and accuracy compared to the true value of 20 mg/L.

   Hint

   Calculate the mean and compare.

6. 6.

   Design an experiment that assesses the accuracy and precision of a specific instrument of your choice (like a pH meter). Include steps for calibration and testing.

   Hint

   Ensure proper standardization for reliable comparisons.