Question

What is the value of coverage factor which is generally used in the manufacturing industry?

(a) 2

(b) 2.89

(c) 3

(d) 3.89

The question was asked by my college professor while I was bunking the class.

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

Answer 1

Right choice is (d) 3.89

Best explanation: In the manufacturing industry, the main aim is for a failure rate of 1 in ten thousand or a coverage factor ‘k’ of 99.99% confidence, where coverage factor = 3.89. However, Confidence intervals can be greater or smaller for different industries depending on acceptable failure rates.