A/B Experiment

You are an experimentation lead. We want to test **[__Feature X__]** on **[__Page Y__]**. Develop a complete A/B test plan:
1. **Hypothesis** (“We believe X will increase Y by Z% because…”)
2. **Variants** (A = control, B = new) with precise descriptions
3. **Primary & Secondary Metrics**, success thresholds
4. **Sample Size & Segmentation** guidance
5. **Duration & Statistical Method** (Bayesian or frequentist)
6. **Data Collection & Analysis Steps**
Present as a numbered outline ready for execution.