Base rates
Why a 95%-accurate test for a rare thing is mostly wrong when it fires, and how to reason about it without the algebra.
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What counts as knowing this
Work out how often a positive result is actually correct, given the underlying rate
A check for this one skill
Up to 2 questions on this skill alone, marked against the bar beside this. It stops as soon as the answer is clear. No account, and your answers are not kept.
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Start on Statistics & Data Literacy
Every skill above, ordered by what depends on what, with the projects above that as the evidence you actually did it. We work out where you already are first, so the path skips what you can do.
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