Cvs Health Interview Questions
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Design classification under missingness and imbalance
30-Day Readmission Classifier: End-to-End Plan Context: You are building a binary classifier to predict 30-day readmission using claims and EHR featur...
Compute A/B significance, CI, and power
You run an A/B test for 7 days. Control A: 520 conversions out of 10,000 sessions. Variant B: 630 conversions out of 11,500 sessions. Use a calculator...
Build a leak-free sklearn churn pipeline
Take‑Home ML Task: Reproducible Subscription Classification Pipeline You are given a daily user-level dataset and must build a reproducible Python (sc...
Handle challenges in MMM/MMX
MMM Fragility Diagnosis and Remediation Plan (Weekly, 156 Weeks) Context You inherit a weekly Marketing Mix Model (MMM/MMX) with 156 weeks of data. Th...
Implement R² and Compare PCA With/Without Scaling
NumPy-only implementation: R² and PCA (Data Scientist take-home) Implement from scratch using only NumPy (no scikit-learn). Use float64 throughout and...
Calculate annual percentages and YoY by cohorts
Answer both SQL and Python parts. Be precise about deduping and denominator choices. SQL schema (sample rows): orders order_id | user_id | order_date ...
Use pandas to aggregate, pivot, and label
Given two pandas DataFrames, write code to: (1) merge and aggregate revenue; (2) produce a 2x2 pivot; (3) compute per-state counts with value_counts, ...
Explain Causal-Inference Techniques in Your Machine Learning Project
Technical Deep-Dive: ML Project With Causal Inference Prompt Walk me through one machine-learning project you led and explain any causal-inference tec...
Explain your top strengths concretely
Behavioral Prompt: Strengths, STAR Evidence, and 90-Day Application Instructions State your top one or two strengths most relevant to a Senior Data Sc...
Build an uplift model for targeting
Flu-shot Campaign: Treatment-Effect Modeling and Targeting Policy You have historical campaign logs from last season that include randomized holdouts....
Calculate CI and Test Correlation Under Normality
Inference on a Mean, Significance of a Correlation, and a Normal Quantile Assume standard parametric conditions (normality as stated). Show formulas, ...
Launch and measure a TV campaign
6-Week Linear TV Experiment to Increase Flu Vaccinations Design a 6-week linear TV campaign and its measurement plan to causally estimate incremental ...
Explain p-value and choose correct test
Technical Screen: P-values and Robust Two-Sample/Paired Tests Context: You are a data scientist evaluating healthcare interventions. Answer in clear, ...
Tune classifier and compute key metrics
Payment Error Classifier — Evaluation, Thresholding, and Cost-Sensitive Design Context You built a binary classifier to flag incorrect payments (posit...
Describe handling pressure and stakeholder conflicts
Behavioral/Scenario Questions for a Data Scientist — Technical Screen Answer concisely using STAR (Situation, Task, Action, Result) where relevant. 1....
Design a flu-shot A/B/n campaign experiment
Fall 2025 Flu Vaccination Uplift Experiment — Design and Evaluation Context (assume a large US pharmacy with loyalty IDs) - Audience: Adults with loya...
Design Experiments for Causal Inference in Marketing Analytics
Technical Phone Screen: Marketing Experiments and Causal Inference Prompt You are interviewing for a data-science role focusing on marketing experimen...
Assess Work Authorization and Professional Experience for Job Change
Initial HR Phone Screen — Behavioral Questions (Data Scientist) Context You are in an initial HR/phone screen for a Data Scientist role. The goal is t...
Create and query an e-commerce schema
PostgreSQL only. 1) Create these tables with appropriate types and constraints (choose minimal correct types): products(product_id PK, name NOT NULL, ...
Diagnose a failing campaign
Vaccination-Lift Experiment Triage Plan Context: You ran a randomized CRM experiment (e.g., email/SMS/push) to increase vaccination uptake. The overal...