Walmart Labs Data Scientist Interview Questions
Master your tech interview with our curated database of real questions from top companies.
Find Index Pairs of Matching Elements in Arrays
Scenario Marketing analytics team needs to find common elements between two sorted arrays of user IDs. Question Given two sorted integer arrays withou...
Assess Cultural Fit in Informal Hiring Conversations
Behavioral & Leadership — Informal Conversation Context Onsite conversation with a hiring manager for a Data Scientist role to assess cultural fit. Ex...
Calculate Sample Size for Effective A/B Test Design
A/B Test Planning: Sample Size and Power Scenario You are planning an online A/B test to evaluate a new marketing feature. The primary success metric ...
Understand Propensity Score Matching in Business Analytics
Propensity Score Matching (PSM) in Observational Product Data Context You work on a growth analytics team estimating causal effects (e.g., of a featur...
Evaluate K-Fold Cross-Validation for Model Selection
Model Selection and Validation for a New Feature Launch You are selecting and validating predictive models (supervised learning) for a new product fea...
Predict Next-Period Conversion Rate Using Historical Campaign Data
Predicting Next-Period Conversion Rate from Campaign Logs Context You have historical campaign panel data with columns: adid, date, impressions, click...