Plan an A/B test for the pricing page

You
Help me design an A/B test for the pricing page.
Claude Sonnet 4.6
Three things to nail down first: 1. What metric — revenue per visitor is more honest than conversion rate. 2. What you're varying — copy alone, copy + price, or layout? 3. Cohorting — split by referrer source so paid traffic doesn't dominate the signal. Want me to sketch the experimental design?

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