Chi-square Goodness of Fit
Do observed counts match the expected distribution?
Observed (Oᵢ)
Expected (Eᵢ)
df = categories − 1 = 1. Add/remove categories by toggling — but chi-square needs Eᵢ ≥ 5 to be valid.
χ² statistic
1.440
Σ (Oᵢ − Eᵢ)² / Eᵢ, df = 1
Fail to reject H₀ — 1.44 ≤ 3.84: fit is plausible.
Critical χ²(0.05, df=1) = 3.84.