A/B Lift: Difference, Interval, Decision
Compute a conversion-rate difference and interpret uncertainty.
A/B Lift: Difference, Interval, Decision Observed difference plus uncertainty interval plus decision threshold. The shortcut is to report the first tidy number and skip the unit, denominator, or uncertainty that makes the calculation meaningful. Step 1 Name the unit of analysis and write the raw quantities. This prevents mixing customers, accounts, tickets, and percentages as if they were interchangeable. Step 2 Apply the formula using the correct denominator or comparison. Most workplace statistics errors are denominator errors disguised as insight. Step 3 Compare the result with the decision threshold and uncertainty. The calculation becomes useful only when it changes or…
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