9.1. Statistical Considerations

Try these first

1. 1.

   What is meant by sample volume in environmental analysis?

   Hint

   Think about the impact of sample size on detection.

2. 2.

   Explain the difference between precision and accuracy.

   Hint

   Consider a bullseye target; consistency versus closeness.

3. 3.

   What is the term for the smallest amount of substance that can be accurately measured?

   • Detection Limit
   • Sample Volume
   • Sensitivity

   Hint

   Think about what determines whether you can detect a substance at all.

4. 4.

   True or False: Precision and accuracy are the same in measurements.

   • True
   • False

   Hint

   Visualize a target; are the arrows clustered together or close to the bullseye?

5. 5.

   You are tasked to measure heavy metals in a lake. Your previous measurements indicate low levels, but your detection limit is higher than expected concentrations. What steps could you take to ensure reliable data?

   Hint

   Think about volume and sensitivity in relation to detection limits.

6. 6.

   During a water audit, you collected multiple samples that showed different TSS readings. Discuss how variations could arise and what it means for data analysis.

   Hint

   Consider factors affecting sample consistency.