Confidence interval for the mean value of Y

A confidence interval for the mean value of Y is a range of values, usually expressed as a lower bound and an upper bound, that is calculated from a sample of data and provides an estimated range in which the mean value of Y is likely to fall. This range is typically calculated by taking several random samples of data and then calculating a confidence interval based on the data. The confidence interval provides information about how precise the estimate of the mean value of Y is.