Design an A/B Test and Statistical Plan

Design an A/B test to validate the impact of '{{change_description}}' on {{product_name}}. Provide: 1) clear hypothesis; 2) primary and secondary metrics with definitions; 3) baseline values and Minimum Detectable Effect (MDE); 4) sample size and traffic allocation calculations with assumptions; 5) experiment duration estimate; 6) segmentation and guardrail metrics; 7) analysis plan (statistical tests, significance thresholds, correction for multiple comparisons); and 8) rollout recommendation based on potential results. Explain assumptions and risks.