Worked Walkthrough: Read A Two-Proportion Result
Interpret observed conversion differences using effect size, confidence interval, and statistical significance.
Interpret 2,420/44,000 control purchases versus 2,590/44,200 treatment purchases. Counts -> rates -> absolute lift -> uncertainty -> decision The common trap is to report only relative lift because it sounds more impressive than the absolute point change. Rates Control: 2,420 / 44,000 = 5.50%. Treatment: 2,590 / 44,200 = 5.86%. Rates put unequal group sizes on the same scale before comparing performance. Lift Absolute lift is about +0.36 percentage points; relative lift is about +6.5%. Absolute lift drives business impact. Relative lift is useful only when the baseline is visible. Uncertainty Use the planned two-proportion test or confidence interval to…
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