One Proportion Z-Test Calculator
Test if a sample proportion differs from a hypothesized population proportion
About One Proportion Z-Test
Formula: z = (p̂ - p₀) / √(p₀(1-p₀)/n)
Assumptions:
- Random sample
- np₀ ≥ 10 and n(1-p₀) ≥ 10
- Independence of observations
Wilson CI is recommended over Wald CI for better coverage.