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Foundational30 minA/B TestingStatistical Rigor

Email Subject Line A/B Test

Lumen & Loom is a mid-sized direct-to-consumer home goods brand that sells bedding, towels, and bath accessories primarily through its website. Lifecycle marketing runs a weekly promotional email to its opt-in subscriber base, and small A/B tests on subject lines are a routine part of the calendar.

Last week, the lifecycle team ran a standard A/B test on the weekly promo email, splitting the list randomly between two subject line variants.

The business question

Which subject line variant performed better, and should we roll it out to the full list?