This question evaluates causal inference, experimentation design, metric-driven trade-off analysis, and business-metric instrumentation skills in the analytics & experimentation domain for a data scientist role, emphasizing practical application with underlying conceptual reasoning.

You are an analytics data scientist at a consumer marketplace. A blocking splash pop-up prompting visitors to download the mobile app was launched on mobile web. Soon after, the partner-referral channel shows a sharp drop in first-time purchaser conversions. Overall online traffic volume is unchanged.
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