Chi Square Distribution Calculator: run chi square distribution calculations online. Formula, assumptions, and interpretation guide.
CI = x̄ ± z* × (s / √n)
Where x̄ = sample mean, z* = critical value (1.96 for 95% CI, 2.576 for 99% CI), s = sample standard deviation, n = sample size.
For proportions: CI = p ± z* × √(p(1−p)/n), where p is the sample proportion.