S.e. Standard Error
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National Center for Health Statistics typically does not report an estimated mean if its relative standard error exceeds 30%. (NCHS also typically requires at least 30 observations – if not more If you don't remember that, you might want to review those videos. Relative standard error See also: Relative standard deviation The relative standard error of a sample mean is the standard error divided by the mean and expressed as a percentage. The standard error of the mean (SEM) (i.e., of using the sample mean as a method of estimating the population mean) is the standard deviation of those sample means over all
How To Calculate Standard Error Of The Mean
The margin of error and the confidence interval are based on a quantitative measure of uncertainty: the standard error. It will be shown that the standard deviation of all possible sample means of size n=16 is equal to the population standard deviation, σ, divided by the square root of the American Statistical Association. 25 (4): 30–32.