A/B test subject lines
Optimize subject lines through testing
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Design an email subject line A/B test for [email type: newsletter / promotional / nurture] to [audience size: N subscribers]. Define: the hypothesis being tested (e.g., 'personalization increases open rate'), control and variant subject lines, test audience split (50/50 or winner-send), duration before declaring winner, statistical significance threshold, and what you will change in future sends based on each possible outcome.
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