Standard Error (SE) of sample mean (x̅) in random sampling from an infinite population or in random sampling with replacement is given by
1
SE = \(\rm\frac{\sigma^2}{\sqrt{n}}\) where σ is the population standard deviation
2
SE = \(\rm\frac{\sigma}{\sqrt{n^2}}\) where σ is the population standard deviation
3
SE = \(\rm\frac{\sigma^3}{\sqrt{n}}\) where σ is the population standard deviation
4
SE =\(\rm\frac{\sigma}{\sqrt{n}}\) where σ is the population standard deviation