Statistics › Section I · Hypothesis testing with one sample › Topic I.1
Null and alternative hypotheses
Every hypothesis test starts with two competing statements about a population. Writing them correctly, before any data are examined, decides everything the test can later conclude.
In this topic
- Innocent until evidence
- The null hypothesis
- The alternative hypothesis
- Parameters, never statistics
- Reading the wording into the form
- Worked example: three claims, six statements
- Worked example: debugging bad hypotheses
- Why the null gets the presumption
- Common mistakes to avoid
- Key takeaways
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