Discussion
Consider the following statements about instrument agreement.
1. Agreement on differences is better than on absolute values.
2. Systematic errors largely cancel when a difference is taken.
3. Two instruments always report identical absolute values.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 go together and are the reason a supply chain can work with different instruments at each end. Statement 3 is not true of any two real instruments - absolute values differ by an amount that matters, which is why standards and batches should be measured on the same machine wherever possible.
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