confidence interval

A confidence interval is a range of values that is likely to contain the true population parameter. It is calculated from a sample of data and is used to estimate the population parameter. The confidence interval is calculated by taking a sample of data, calculating the mean, and then adding and subtracting a margin of error to the mean. The margin of error is determined by the confidence level desired, which is usually 95%. The confidence interval is then expressed as a range of values, such as 95% confidence interval of (x, y).