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

What is the value of coverage factor which is generally used in the manufacturing industry? Correct Answer 3.89

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.

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