Dear all,(adsbygoogle = window.adsbygoogle || []).push({});

I have a specification from a tool, which says, 80% of the reported measurements are within plus or minus 10% of the actual, at 95% confidence level.

I am trying to make sense out of this statement.

Assuming a normal distribution, please can someone tell me how to interpret these data?

I was interpreting that 95% of the measurements will be within the shaded area represented by a normal curve. The right hand side limit will be = actual+10% of actual, the left side limit will be actual-10% of actual. Where does 80% come from?

I am totally confused. Please help.

Thanks.

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# Accuracy and confidence intervals onf measurements

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