search for: 3sigma

...mple result was also over the limit; whether the arresting officer had it in for the defendant and so on. So a more accurate interpretation of ted's example would be that after the positive analysis and statistical test result, there was strong or very strong evidence (you'd need at least 3sigma to say even that much actually, and the UK convention is exceedence by at least 6mg/100ml) that the sample as tested showed contained an amount of alcohol over the legl limit. With suitable supporting evidence, the strength of that evidence would, for a 'reasonable man' (ie the proverbial m...