Mathematical Methods · confidence intervals · manipulative
Unlike a mean CI with fixed σ, E = z√(p̂(1−p̂)/n) is widest at p̂ = ½ and collapses when p̂ is near 0 or 1.
Interval around p̂
How E depends on n (current z and p̂ fixed)
Confidence level
Presets jump; the slider sets any whole-number level from 80% to 99%.
Working