The x-bar is the symbol (or expression) used to represent the sample mean, a statistic, and that mean is used to estimate the true population parameter, mu.
What is X and X bar in standard deviation?
Calculating the Standard Deviation where (“x minus x-bar)2 is the square of the difference between each individual measurement (x) and the mean (“x-bar”) of the measurements. The symbol sigma indicates the sum of these, and n is the number of individual measurements.
