What does a high Standard Deviation (SD) indicate about measurement results?

• A. Results are clustered near the average
• B. Results vary significantly from the average
• C. Results are consistently the same
• D. Results are untrustworthy

Answer: (B)

A high Standard Deviation (SD) indicates that the measurement results vary significantly from the average. This means that there is a larger spread or dispersion of the data points around the mean value. When the SD is high, it reflects that individual measurements are more widely scattered, and this can suggest that the measurements are less consistent.

In the context of radon measurement, understanding variability is crucial because it can impact the interpretation of radon levels in a given environment. A high SD could mean there are fluctuations due to varying radon sources, changes in environmental conditions, or differences in measurement techniques. This information can help technicians assess the reliability of their measurement outcomes and decide if further investigation or repeat measurements are necessary to arrive at a more accurate assessment of radon levels.