Diagnose Checkout Rate Drop: Steps and Analyses

##### Scenario A key business metric (e.g., daily active users or conversion rate) suddenly spikes or drops. Leadership wants a root-cause analysis and next steps within a few hours. ##### Question Our checkout-completion rate fell by 7% yesterday while traffic stayed stable. How would you diagnose the cause, what analyses or experiments would you run, and how would you prioritize fixes? ##### Hints Walk through segmentation, upstream funnel checks, cohort comparisons, A/B flag changes, external events, and how to quantify impact.