What is a true statement regarding a confidence interval (CI)?

A confidence interval (CI) is a statistical range used to estimate the uncertainty around a sample statistic. The statement that the smaller the CI, the more precise the range of values, is accurate because a narrower confidence interval indicates that the data have less variability and thus provides a more specific estimate of the true population parameter. A small CI suggests that the sample mean is closely clustered around the true mean, which enhances the reliability of the results.

In contrast, a larger confidence interval implies greater uncertainty and variability in the sample data. This broader range means that the estimates are less precise, as they cover a wider swath of potential values for the population parameter. Consequently, a smaller CI is indicative of higher precision in estimating the true effect or mean. Hence, the understanding of CIs is crucial in radiological technology, where accurate measurements and assessments are essential for diagnosis and treatment planning.