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False positives at NSA

Ethics aside, Is NSA's spy tool efficient?
by Carl Bialik, Wall Street Journal, 14 June 2013

Do the numbers behind prism add up?
by Carl Bialik, Numbers Guy blog, Wall Street Journal, 14 June 2013

False positive paradox in diagnostic medical testing: if we conduct wide scale testing in a low risk population, a surprisingly large proportion of the positives will be false.

Submitted by Bill Peterson, based on a suggestion from Margaret Cibes