The Confidence Interval (CI)

Population Parameters The confidence interval (CI) indicates the upper and lower range of values between which the value for the true population is likely to fall. It helps to understand the likelihood that the score or mean value for a health condition derived from a sam- ple is similar to the value in the true population. Confidence intervals, like standard deviations, provide a level of assurance about whether the mean or score value for the variable reflects the value for the whole population. For example, if a score is within the CI, then the value falls within a range that is reflective of the larger population. However, if the value falls outside the CI, then that score can be viewed as being important because it is different from the value in the general population.

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