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alanocufollowshare
5-20-2008 5:29 PM962 views
alanocu says:
"Here's how that works: imagine that you've got a disease that strikes one in a million people, and a test for the disease that's 99% accurate. You administer the test to a million people, and it will be positive for around 10,000 of them – because for every hundred people, it will be wrong once (that's what 99% accurate means). Yet, statistically, we know that there's only one infected person in the entire sample. That means that your "99% accurate" test is wrong 9,999 times out of 10,000!"

"If we were good at understanding statistics, then here's what would happen when you flew to Las Vegas. You'd step out of McCarran airport, stare down the Strip at all those glittering, palatial casinos and say to yourself, "Holy crap – think of all the suckers who must have lost everything to finance this place!" Instead, our foolish minds are filled with thoughts like, "Man, look at all the money in this town – I'm going to win big!" And another casino is built."
3 Comments   | Add a Comment
5-21-2008 11:31 AM
AcesLucky
Great example! Marylin Vos Savant exposed that same "false positive" scenario with people being tested for drug use for jobs.

But terrorist attacks and the like are not subject to the same probability structures. The success of an attack is not a matter of getting a 6 with the roll of a six-sided die.

The roll of a (fair) die is governed by probability. If it's fair, we cannot control it. The advent of an attack, however, is completely governed by "controllable" variables.

But Vegas? Dead nuts, right on target. But the shows are great!
6-13-2008 8:37 AM
Ashley_C_1
Another statistical error: The chance that there are 2 bombs on the same plane is almost nihil, so the solution for people that don't want to end up on a plane with a bomb: bring your own!
6-13-2008 1:28 PM
AcesLucky
Ha!

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