{"name":"ab_test","title":"A/B Test Significance (two-proportion z-test)","category":"statistics","description":"Conversion rates, lift, z-score, p-value and significance for two variants.","price_usd":0.002,"input_schema":{"type":"object","properties":{"conversions_a":{"type":"number","description":"Conversions in variant A"},"visitors_a":{"type":"number","description":"Visitors in variant A"},"conversions_b":{"type":"number","description":"Conversions in variant B"},"visitors_b":{"type":"number","description":"Visitors in variant B"},"confidence":{"type":"number","description":"Confidence level 0..1 (default 0.95)"}},"additionalProperties":false,"required":["conversions_a","visitors_a","conversions_b","visitors_b"]}}