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What is the confidence interval for the value of coverage factor ‘2’?

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What is the confidence interval for the value of coverage factor ‘2’?

(a) 95 %

(b) 94 %

(c) 95.45 %

(d) 94.45 %

The question was posed to me in homework.

The question is from Expanded Uncertainty in chapter Evaluating Uncertainty in Measurement of Engineering Metrology

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The correct choice is (c) 95.45 %

To explain: Confidence interval for the value of coverage factor 2 is generally taken as 95 % but it is not the actual value. The actual value for this is 95.45 %. For 95 % confidence interval, actual ‘k’ or coverage factor is 1.96.

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