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Hypothesis test selector

Answer eight questions about your study design and get a recommended statistical test, the reasoning behind it, and the assumptions to check.

Pick a goal to start.

This is a decision guide, not a calculator: it names a test, says why, and lists the assumptions to check. It does not compute statistics or p values, and it cannot see your data, so every "yes" answer about normality or spread is your claim, not a finding. "Not sure" answers deliberately route to versions that keep their meaning when the assumption fails, which costs a little power in exchange for honesty. Independence of observations is assumed in every path; no answer here can fix a design where the same case is counted several times.
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Markdown version: https://nutter.tools/data/hypothesis-test-selector.md
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