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Data Driven Recommendations and Impact Questions

Covers the end to end practice of using quantitative and qualitative evidence to identify opportunities, form actionable recommendations, and measure business impact. Topics include problem framing, identifying and instrumenting relevant metrics and key performance indicators, measurement design and diagnostics, experiment design such as A B tests and pilots, and basic causal inference considerations including distinguishing correlation from causation and handling limited or noisy data. Candidates should be able to translate analysis into clear recommendations by quantifying expected impacts and costs, stating key assumptions, presenting trade offs between alternatives, defining success criteria and timelines, and proposing decision rules and go no go criteria. This also covers risk identification and mitigation plans, prioritization frameworks that weigh impact effort and strategic alignment, building dashboards and visualizations to surface signals across HR sales operations and product, communicating concise executive level recommendations with data backed rationale, and designing follow up monitoring to measure adoption and downstream outcomes and iterate on the solution.

HardSystem Design
25 practiced
Design a multi-armed bandit approach to maximize revenue from several personalization strategies while still allowing reliable estimation of treatment effects for decision-making. Discuss exploration policy (epsilon-greedy, Thompson Sampling), how to handle delayed rewards, offline evaluation/bootstrapping, and guardrails to avoid business harm.
HardTechnical
23 practiced
Ethics case: Your personalization algorithm appears to systematically favor a subset of users and reduce engagement among an underrepresented group. Propose a detection, mitigation, and governance plan: include fairness metrics to monitor, how to implement bias tests in A/B tests, short-term mitigation steps, and long-term policy changes to reduce harm.
EasyTechnical
32 practiced
Explain the difference between statistical significance and practical (business) significance. Provide an example where a statistically significant result should not trigger rollout and explain the additional checks or analyses you would run before making a decision.
HardTechnical
32 practiced
Case study: Estimate the incremental LTV uplift over 12 months from a recommender expected to increase monthly retention by 1.5 percentage points. Inputs: active users = 500k, baseline monthly retention = 75%, ARPU per month = $10, discount rate monthly = 0.5%. Provide the calculation steps, the 12-month incremental revenue, and a sensitivity analysis for +/- 0.5% retention lift.
MediumSystem Design
32 practiced
Design an experimentation platform (high-level) for a mid-size company: include components for randomization, assignment storage, telemetry ingestion, metric computation, guarding against Sample Ratio Mismatch, and an API for product teams to create experiments. Sketch versioning, reproducibility, and how teams get metric reports.

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