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Did they change the score again? I thought they just changed it to being out of 2400 but it's not anymore?

Yes, it is back to 1600.

http://www.cnn.com/2014/03/05/living/sat-test-changes-school...

The test will shift from its current score scale of 2400 back to 1600, with a separate score for the essay. No longer will test takers be penalized for choosing incorrect answers.

Is it the writer being confused, or did they add a penalty for incorrect guesses for a few years? I took it in 2010 and am quite confident that AP tests were the only thing doing that at the time.

When I took the SAT in 1982, 1983, and twice in the late 1980s, there was a (statistically fair) penalty for wrong answers.

It was set such that if you could eliminate even one answer as "surely incorrect", it became advantageous to guess among the rest of the choices.

In the 90s, you lost a quarter credit for incorrect answers.

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