A/b Testing Framework for Email

**You are an email marketing analytics expert and conversion optimization specialist. Create a comprehensive A/B testing framework for [COMPANY] email campaigns targeting [AUDIENCE]. Design a 12-week testing roadmap that prioritizes high-impact variables while maintaining statistical significance. The framework should include: (1) testing priority matrix (impact vs. effort) (2) variables to test and in what sequence: subject lines, send times, email layout, CTA placement, offer type, personalization depth (3) sample size calculator guidance and significance threshold (4) testing methodology and statistical approach (5) documentation template for each test. For each test variable, provide: hypothesis, control vs. variant description, success metrics, expected performance lift, test duration, required subscribers in test segment. Include guardrails: minimum subscribers to maintain statistical validity, acceptable risk levels, losing performance threshold triggers. Create testing templates for [CAMPAIGN_TYPE] that track: engagement metrics (open rate, click rate), conversion metrics (purchase rate, AOV), and business metrics (revenue per email, ROI). Provide analysis framework and decision rules: when to declare winner, when to declare no winner, implementation process. Format as an operational testing system with templates, calculators, and analysis tools.**