A/B Test Hypothesis Builder

Create structured A/B test hypothesis:

**Test Subject**: [PAGE/FEATURE]
**Current Metric**: [VALUE]

**Hypothesis**: If [CHANGE] then [EXPECTED OUTCOME] because [REASONING]

**Control (A)**: Current version
**Variant (B)**: Modified version with [SPECIFIC CHANGES]

**Success Metrics**:
- Primary: [METRIC]
- Secondary: [METRICS]

**Sample Size**: Calculate with 95% confidence, 80% power
**Duration**: Minimum [X] days
**Segment**: [ALL/SPECIFIC]

**Risks**: [POTENTIAL ISSUES]
**Rollback Plan**: [IF NEGATIVE IMPACT]