Standard Error (SE) Formula

A deviation of the sample mean from its actual mean of a population is standard error. The formula of standard error is the ratio of the standard deviation to the square root of the sample size.


Standard Error of Sample Means


SE = Standard Error
s = Standard Deviation
n = Size (Number of Observations) of the Sample.

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The value of SE of mean decreases as sample size increases. Standard error is used to find confidence interval and margin of error.

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