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Biostatistics & Research · single question

Regarding confidence intervals (CI), which is TRUE?

  1. Narrower CI = greater precision of the estimate
  2. Wider CI = greater precision
  3. CI including zero always indicates significance
  4. CI is the same as the p-value
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Correct answer: A. Narrower CI = greater precision of the estimate

Narrower CI = greater precision (true value estimated more certainly, usually from larger sample size). Wider CI = more variability, less precision. CI that does NOT cross zero (differences) or 1.0 (ratios) = statistically significant.

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