a critical number to know is:
what is the chance that if you test someone who is negative, what is the chance they tests positive.
if you can this x then you multiply this by the number of tests N and then you know the # of false positives...
does anyone remember that term? 
*apparently*
(smdh for not remembering this properly)
the same test can have a false positive rate of near 0% (say you have a great test and/or are testing only very very sick patients in a overwhelming outbreak eg Mexico)
or near 100% (say testing COVID19 in New Zealand)
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