The Wikipedia article on the Ferguson crisis says,
"the population is only one-third white and about two-thirds black"
and then says,
"Ferguson police were twice as likely to arrest African Americans during traffic stops as they were whites"
which only appears anomalous if you ignore the base rate of finding a black driver vs. a white one. (Edited to add: other factors, like how many people in each group own/drive cars, may be relevant.)
There are many valid reasons to worry about racial tensions in that town (e.g. 48/53 police members are white), but the arrest rates is not one of them.
Statistics don't work like you think they do. The number is controlled.
If you come to that conclusion, the thing you should do as a rationalist is "notice confusion". Then you would check the source and would see:
While black residents accounted for 67 percent of Ferguson’s population, black drivers accounted for more than 86 percent of the traffic stops made last year by the Ferguson Police Department, according to a report produced by the office of Missouri Attorney General Chris Koster.
If you want to learn the relevant statistical literacy ...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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