Exercise 2: Why a Controlled Study Beats a Single Smart Example — Possible Solution
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Pointing to one smart person who thinks clearly is genuinely weak
evidence that critical thinking is trainable, because it can't rule
out the alternative explanation: maybe that person was simply born
with an unusually capable mind, and their clear thinking has nothing
to do with any learnable technique at all. A single example, however
impressive, doesn't distinguish between "this is a trait some people
happen to have" and "this is a skill anyone could develop."

The Good Judgment Project's real design directly rules out that
alternative explanation. It didn't study one gifted individual - it
recruited ordinary volunteers, gave many of them structured training in
specific techniques, and then measured their real performance against
a comparison group (professional intelligence analysts) across
hundreds of real questions and over a million actual forecasts. The
volunteers who used the trained techniques - not just people who
happened to be naturally clever - consistently outperformed
professionals with far more relevant credentials and access to
classified information. That controlled comparison is what makes the
result strong evidence for trainability, rather than a story about one
unusually gifted person.

ANSWER: A single smart person can't rule out the possibility that their
clear thinking is simply an innate trait rather than a learned skill.
The Good Judgment Project's real strength is that it tested trained
ordinary volunteers against professional experts using a large,
structured comparison (500 questions, over a million forecasts) - and
the volunteers who used specific techniques won, which is much
stronger evidence that the underlying skill can genuinely be learned,
not just that it can occasionally occur naturally in a gifted
individual.

WHY THIS WORKS AS AN ANSWER
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This explains the real methodological reason a controlled comparison
is stronger evidence than a single example, directly engaging with
what makes the Good Judgment Project's own design convincing.