how do you find the standard error 
the standard error takes the standard deviation and divides it by the square root of the sample size many statistical software packages automatically compute standard errors the bottom linethe standard error se measures the dispersion of estimated values obtained from a sample around the true value to be found in the population statistical analysis and inference often involves drawing samples and running statistical tests to determine associations and correlations between variables the standard error thus tells us with what degree of confidence we can expect the estimated value to approximate the population value 