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Suppose you have a test which is said to be 95% effective at detecting terrorists, and that this is used in mass surveillance on a population of a million people. Suppose the measure of 95% effective applies both to the detecting people who are terrorists and detecting that people are innocent which means that the false match rate and the false non-match rate are both 5%. Suppose furthermore that among the million people there are 100 terrorists. 1. How many genuine terrorists will be found? 2. How many terrorists will escape detection (false non-matches)? 3. How many innocent people will be flagged as terrorists (false matches)