Discussion
Consider the following statements about instrument specifications.
1. Accuracy and precision are different properties.
2. Resolution and sensitivity are different properties.
3. A precise instrument is necessarily accurate.
Which are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: accuracy is closeness to truth and precision is repeatability; resolution is the smallest detectable change and sensitivity is the ratio of output change to input change. Statement 3 is the common confusion - an instrument can be highly repeatable and consistently wrong, which is precisely what a calibration is for.
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