hard20 pts · first answer countsuser-researchexperimentation

Measuring long-term impact

After several successful short A/B tests on notifications, leadership asks whether notifications as a whole help or hurt 6-month retention. Which design answers this best?

A.Summing up the lifts from each past A/B testB.A survey asking users whether they like notificationsC.Comparing this year's retention with last year'sD.A long-running holdout group that gets no notifications

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Measuring long-term impact

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