what is the standard error in estimating r how to work out variance in stratified random sampling how do you calculate the variance in random sampling what is the standard error for each estimate of the population why is x and y considered random sample what is x-y in random sampling what is the difference between a variance and a standard error x_y is the standard error for which a random sampling of data is taken into account. why is it so important to know the standard error of the estimate of x how to calculate variances from the population when using a population variance estimation how to determine sample s which sample has its own standard error in standard sampling? when to use a population sampling method what is x in random sampling which random sampling method is used to estimate the variance of the sample? how is the population estimates compared to the sampling data how to estimate variance of random sampling of population when calculating random sampling of variance what is the standard deviation if x is the estimate of the variance, what is the standard deviation