For a measurement to be accurate, it must be both ________ and __________.

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Prepare for the NRCan XRF Analyzer Operator Certification Level 1 Exam. Utilize flashcards and multiple-choice questions with detailed hints and explanations. Ready yourself for a successful examination!

Multiple Choice

For a measurement to be accurate, it must be both ________ and __________.

Explanation:
Accuracy means measurements are close to the true value, which requires two things: no systematic error (unbiased) and consistent results (precise). If measurements are unbiased but not precise, the average may land near the true value, but individual results can be far off due to random spread. If measurements are precise but biased, they cluster tightly around an incorrect value. Only when there is both no bias and tight clustering do you get true, reliable accuracy. The other options fail because they either include bias, or rely on a term like “exact” that isn’t a standard part of defining accuracy.

Accuracy means measurements are close to the true value, which requires two things: no systematic error (unbiased) and consistent results (precise). If measurements are unbiased but not precise, the average may land near the true value, but individual results can be far off due to random spread. If measurements are precise but biased, they cluster tightly around an incorrect value. Only when there is both no bias and tight clustering do you get true, reliable accuracy. The other options fail because they either include bias, or rely on a term like “exact” that isn’t a standard part of defining accuracy.

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