Confidence Interval


  • As part of a Statistical Estimate, a range of values estimated to contain the true value, with a particular Confidence Level. 1
  • The expected range of results. If you drew repeated samples from the same population, you would expect the result to be within the confidence interval about the proportion of times given by the confidence level. For example, in an election poll, the difference in the proportion of people favoring each candidate is described as being within a range of, say, plus or minus 5%. All other things being equal, the smaller the confidence interval, the larger the sample size needs to be. Said another way, the larger the sample size, the smaller the confidence interval. 2 3

See Also


  1. Maura R. Grossman and Gordon V. Cormack, EDRM page & The Grossman-Cormack Glossary of Technology-Assisted Review, with Foreword by John M. Facciola, U.S. Magistrate Judge2013 Fed. Cts. L. Rev. 7 (January 2013).
  2. Herb Roitblat, Search 2020: The Glossary.
  3. Herb Roitblat, Predictive Coding Glossary.
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