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Prep plan
Updated weekly · Last refresh Aug 30

Children's Hospital of Philadelphia Data Scientist Interview Questions

The questions to prepare for a Children's Hospital of Philadelphia Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

26questions
~4htotal time
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1
SQL & Data ManipulationStart here. 8 questions + 2 drills · ~88 min
2
Model Evaluation3 questions · ~25 min
Precision-Recall vs ROC-AUCMedium

Tests metric selection and interpretation for imbalanced healthcare classification tasks.

PrecisionAUC-ROCRecallChildren's Hospital of Philadelphia
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3
Machine Learning11 questions · ~93 min
Missing Values and Classification in ColabEasy

Tests end-to-end data cleaning and baseline classification modeling in Python.

Cross-ValidationFeature EngineeringSupervised LearningChildren's Hospital of Philadelphia
Prevent Overfitting LiveHard

Tests model generalization techniques and ability to reason clearly under interview conditions.

Cross-ValidationBias-Variance TradeoffRegularizationChildren's Hospital of Philadelphia
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4
More topics4 questions · ~34 min
EHR Data Pipeline DesignHard

Tests pipeline design for EHR data including extraction, cleaning, and modeling readiness.

ETLData ModelingQualityChildren's Hospital of Philadelphia
EDA for Missingness and CorrelationsMedium

Tests statistical reasoning and practical EDA workflow for messy real-world data.

DistributionsRegressionCorrelationChildren's Hospital of Philadelphia
NLP Basics and ML ConceptsMedium

Assesses core NLP knowledge and understanding of validation and feature engineering.

Feature EngineeringNLPChildren's Hospital of Philadelphia
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The finish line: interview-readyComplete all 26 questions plus 2 hands-on drills to finish this plan.