Introduction to biostatistics: Part 3. Statistical approaches to uncertainty: P values and confidence intervals unpacked

Doll, Helen; Carney, Stuart
May 2006
ACP Journal Club;May/Jun2006, Vol. 144 Issue 3, pA8
Academic Journal
The article presents information related to statistical uncertainty. Statistical uncertainty is the uncertainty associated with the use of sample data to make statements about the wider population. Either hypothesis tests, with the calculation of P values, or confidence intervals (CIs) can quantify the amount of statistical uncertainty present in a study, though CIs are usually preferred. P values are used to assess whether a sample estimate is significantly different from a hypothesized value. The CI provides a range of values whose limits are, with specified probability, the smallest and the largest true population values consistent with the sample data.


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