Confidence interval
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A confidence interval is a range of values that is likely to contain the true population parameter with a certain level of confidence. It is calculated from a sample of data and is used to estimate the population parameter. The confidence interval is typically expressed as a lower and upper bound, with a certain level of confidence, such as 95%. This means that if the same sample is taken multiple times, 95% of the time the true population parameter will be within the confidence interval.