Discussion
Consider the following statements about measurement uncertainty.
1. Sample non-uniformity often dominates the total uncertainty.
2. Averaging several positions reduces that contribution.
3. Instrument repeatability is usually the largest single term.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: sample non-uniformity is very often the largest contribution, and averaging over positions reduces it. Statement 3 is the misconception - instrument repeatability is usually the smallest term of the three, and an uncertainty estimate based on it alone will be far too optimistic.
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