Earlier quoted context omitted.
> So it's not testing for anything real. You are too quick to dismiss the study, I think. What the study shows, I think, is that other things being equal the person who sounds to be from higher class is likely to get the job. The study simulates the other things being equal scenario by eliminating all other avenues for the hiring manager to judge. Here is the quote from the TFA, lightly edited for emphasis: The study…
This is how research works, you isolate variables. By OP’s logic science is never testing for anything “real.” I’m not surprised that HN rushes to discredit the idea that hiring is not a perfect meritocracy, but this is kinda silly.
a) only speech
b) lots of complex skills-based information that is (verified in a separate experiment) equivalent on balance, plus also speech
It's quite possible that you could see a large difference in decisions in (a) without any detectable difference in (b).
For example, imagine in this study hiring managers are (perhaps subconsciously) estimating education level from speech. If they already have lots of details about candidate's education, that "screens out" the rough proxy of their speech patterns.