Yahoo interview questions

Showing 1–8 of 8 results

• Calculate Expected Flips for Heads-Tails SequenceEasy

  This interview question evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer for Calculate Expected Flips for Heads-Tails Sequence states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  YahooData ScientistStatistics & MathTechnical Screen
• Calculate Total Spend and Identify Key User MetricsMedium

  This question evaluates a data scientist's proficiency in transactional data manipulation using SQL and Python, focusing on aggregation, ranking, joins, date arithmetic, and numeric rounding to produce user-level and time-series metrics.

  YahooData ScientistData Manipulation (SQL/Python)Technical Screen
• Evaluate Widget Impact on User Engagement with A/B TestingMedium

  This interview question evaluates metric design, causal reasoning, experiment setup, diagnostics, SQL/statistical checks, and recommendations in a realistic interview setting. A strong answer for Evaluate Widget Impact on User Engagement with A/B Testing states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  YahooData ScientistAnalytics & ExperimentationTechnical Screen
• ML Concepts: Overfitting, Bias-Variance Trade-off, Class Imbalance, Missing DataEasy

  A machine learning fundamentals round covering overfitting and underfitting, the bias-variance trade-off, class imbalance, and missing data. It tests whether a candidate can define each concept precisely, diagnose it from training and validation evidence, and choose remedies while weighing their side effects.

  YahooMachine Learning EngineerMachine LearningTechnical Screen
• Merge words by head-tail chainingMedium

  This question evaluates graph-theoretic reasoning and string-manipulation skills, focusing on the ability to reason about ordering constraints, edge cases like self-loops and multiple identical relationships, and traversal over relationships between items.

  YahooData ScientistCoding & AlgorithmsTechnical Screen
• Prove Equal Probability Impossible with Relabeled Dice FacesMedium

  This interview question evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer for Prove Equal Probability Impossible with Relabeled Dice Faces states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  YahooData ScientistStatistics & MathTechnical Screen
• Rank Items by Dot-Product Similarity to a User Embedding, Excluding Seen ItemsEasy

  Rank candidate items for a user by the dot product of the user's embedding with each item's embedding, returning item indices from highest to lowest score with ties broken by index. A follow-up removes items the user has already seen, testing vectorized scoring, sorting and filtering.

  YahooMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Solve Data Structure Challenges with Python AlgorithmsMedium

  This question evaluates proficiency in fundamental data structure manipulation and string-processing algorithms, specifically preserving insertion order during list deduplication and performing iterative overlap-based word merging.

  YahooData ScientistCoding & AlgorithmsTechnical Screen