CWEA Grade 2 Lab Analyst Practice Test

Which statement correctly describes what the mean and standard deviation indicate in analytical results?

Accuracy Bias Correlation Precision

Correct Answer:

Precision

Explanation:

Precision is about how repeatable the measurements are. The mean gives the central value of the results, while the standard deviation shows how spread out those results are around that center. A small standard deviation means the measurements are tightly clustered, indicating high precision; a larger standard deviation means more variability, indicating lower precision. The mean alone doesn’t tell you how close those results are to the true value—that’s about accuracy. Correlation isn’t described by mean and spread. So, together, the mean and standard deviation indicate precision.

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