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Jiro comments on Open thread, 25-31 August 2014 - Less Wrong
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That doesn't follow. For instance, imagine that one group is irrational because their brains freeze up at any problem that contains the number 8, and some tests contain the number 8 and some don't. They'll fail the former tests, but be indistinguishable from the first group on the latter tests.
I can imagine a lot of things that have no relationship to reality.
In any case, you were talking about a test that has a 50% chance of detecting the difference, presumably returning either 0% or 20% but never 10%. Your example does not address this case -- it's about different tests producing different results.
You were responding to Stefan. As such, it doesn't matter whether you can imagine a test that works that way; it matters whether his uncertainty over whether the test works includes the possibility of it working that way.
If you don't actually know that they freeze up at the sight of the number 8, and you are 50% likely to produce a test that contains the number 8, then the test has a 50% chance of working, by your own reasoning--actually, it has a 0% or 100% chance of working, but since you are uncertain about whether it works, you can fold the uncertainty into your estimate of how good the test is and claim 50%.