How It Works
Mean ± critical value × SD/sqrt(n). Unknown population SD uses Student t with n−1 degrees of freedom.
Assumes independent random sampling and a normal population or sufficiently large sample.
Reference Sources
FAQs
How does this calculator work?
Mean ± critical value × SD/sqrt(n). Unknown population SD uses Student t with n−1 degrees of freedom.
What assumptions should I check?
Assumes independent random sampling and a normal population or sufficiently large sample.