Chi-Square (χ²) Test Calculator
AP Biology — Statistical Analysis of Genetic Crosses
Stage 1–2: Enter Observed Counts
| Category | Observed (O) | Expected Ratio | Expected Count (E) |
|---|---|---|---|
| Total | — | — | — |
Stages 3–5: Step-by-Step Calculation
| Category | O | E | (O − E) | (O − E)² | (O − E)² / E |
|---|---|---|---|---|---|
| χ² = Σ(O − E)² / E = | — | ||||
Stage 5: Decision at p = 0.05
| Degrees of Freedom (df) | Critical Value (p = 0.05) |
|---|