What is the relation of expanded uncertainty with coverage factor and combined uncertainty?

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What is the relation of expanded uncertainty with coverage factor and combined uncertainty?

(a) Expanded uncertainty = Coverage factor * Combined uncertainty

(b) Combined uncertainty = Coverage factor * Expanded uncertainty

(c) Coverage factor = Combined uncertainty * Expanded uncertainty

(d) Coverage factor * Combined uncertainty * Expanded uncertainty = 1

The question was asked in semester exam.

This interesting question is from Expanded Uncertainty topic in chapter Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct option is (a) Expanded uncertainty = Coverage factor * Combined uncertainty

For explanation: The equation which is used to calculate expanded uncertainty is a very basic equation. To calculate expanded uncertainty, one will need to multiply a coverage factor by the combined uncertainty.

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