Frequently Asked Questions
What are degrees of freedom?
The number of independent pieces of information left after estimating parameters. A sample of n has n − 1 df after computing the sample mean.
Why n − 1 instead of n for sample SD?
Bessel's correction. Using n underestimates SD because the sample mean already absorbed one degree of freedom.
Does df matter for large samples?
Less so - as n grows, t approaches z and effects of df shrink. Below n ≈ 30, df matters a lot.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.