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In statistics, a confidence interval(CI) is a type of estimatecomputed from the statistics of the observed data. This gives a range of values for an unknown parameter(for example, a population mean). The interval has an associated confidence levelthat gives the probability with which the estimated interval will contain the true value of the parameter. The confidence level is chosen by the investigator. For a given estimation in a given sample, using a higher confidence level generates a wider (i.e., less precise) confidence interval. In general terms, a confidence interval for an unknown parameter is based on sampling the distributionof a corresponding estimator. [