Both a true correlation and a perception bias may be present, but it would be difficult to distinguish them without using standardized tests.
Correlations between attractiveness and academic performance or criminal record could be confounded by the perception bias, we would need something like IQ or SAT to have a fair estimate.

Also the correlation itself may be caused by perception biases directly, e.g teachers unaware of the halo effect rank the intelligence and agreeableness of the beautiful students greater than they should and such are more unlikely to expel the students or report behavioral problems.

[LINK] Amanda Knox exonerated

by fortyeridania 1 min read28th Mar 201558 comments

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Here are the New York Times, CNN, and NBC. Here is Wikipedia for background.

The case has made several appearances on LessWrong; examples include: