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by scotty79
2005 days ago
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So it's just artifact of testing. Lowest test scores come from low ability plus bad luck and as such are lower than just low ability and highest test scores come from high ability and great luck and as such are higher than just high ability. |
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Unless the test is biased which means we're back to square one - discerning bias of the test from bias of respondent.
To do that you'd have to produce a specifically biased test in a different way, see how the noises add.