A Ninety-Five Percent Confidence Interval (CI) is a statistical range that estimates where a population parameter, like a mean or proportion, is likely to fall. It suggests that if we were to take many samples and calculate a CI for each, about 95% of those intervals would contain the true population parameter. The CI is expressed as two values, typically written as (lower limit, upper limit). For example, if a study finds a mean height of 170 cm with a 95% CI of (165 cm, 175 cm), it indicates that we can be 95% confident that the true mean height of the population lies within this range.