Standard Error Calculator
Calculate the standard error for means, proportions, or differences
About Standard Error
Standard error measures the precision of a sample statistic as an estimate of a population parameter.
Formulas:
- SE of Mean: SE = s / √n
- SE of Proportion: SE = √(p(1-p)/n)
- SE of Difference: SE = s × √(1/n₁ + 1/n₂)
Smaller SE indicates more precise estimates. SE decreases as sample size increases.