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What happens if you test twenty independent hypotheses at a 0.05 threshold?

  1. A Roughly one significant result is expected by chance alone
  2. B All results will be significant
  3. C No results will be significant
  4. D The threshold adjusts automatically
Answer

Roughly one significant result is expected by chance alone

Multiple comparison corrections exist for exactly this reason, and testing until something is significant is a known form of self-deception.

All Data MCQs

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