Question

An analyst reported 40.9 ppm Na in all 10 analyses of the standard solution having a true value of 40.11 ± 0.3 ppm. This data is:

• A. Precise but not accurate
• B. Accurate but not precise
• C. Neither accurate nor precise
• D. Both accurate and precise

Hint:

Precision refers to the consistency of results, while accuracy indicates how close results are to the true value.

Answer 1

The Correct Option is D

Precision: The analyst consistently reported 40.9 ppm for all 10 analyses, showing low variation and high precision.

Accuracy: The reported value (40.9 ppm) falls within the range of the true value (40.11 ± 0.3 ppm), indicating accuracy.

Therefore, the data is both accurate (close to the true value) and precise (reproducible).