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Biostatistics & Research · single question

All else being equal, what generally indicates a 'better' (more precise/informative) confidence interval?

  1. A narrower confidence interval (indicating a more precise estimate of the true population parameter)
  2. A wider confidence interval
  3. A confidence interval that always includes zero
  4. The width of a confidence interval has no relationship to precision
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Correct answer: A. A narrower confidence interval (indicating a more precise estimate of the true population parameter)

A narrower confidence interval, at the same confidence level (e.g., 95%), indicates a more precise estimate of the true population parameter — generally achieved with larger sample sizes and/or less variability in the underlying data. A wider interval reflects greater uncertainty about the true value.

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