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What is used as an input estimate in Type-A evaluation of uncertainty?

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What is used as an input estimate in Type-A evaluation of uncertainty?

(a) Standard deviation

(b) Arithmetic mean

(c) Variance

(d) Geometric mean

I got this question in homework.

My doubt stems from Type A Evaluation of Uncertainty topic in chapter Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct answer is (b) Arithmetic mean

The explanation: The arithmetic mean is used as the input estimate in Type-A evaluation of uncertainty, and the standard deviation of the mean is used as the standard uncertainty. Those evaluation of standard uncertainty that is not a Type-A is a Type-B evaluation.

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