You're the analyst supporting a subscription SaaS company's growth team. They redesigned the signup page and ran a two-week A/B test:
Compute the absolute lift, run a two-sample z-test for proportions, and compute a 95% confidence interval on the difference (treatment − control).
Return a dict result with keys absolute_lift, z_stat, p_value, ci_low, ci_high — all rounded to 4 decimal places.
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Run your code to see the result here.