How do I approach Machine Learning interview questions?

Machine Learning questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master machine learning interviews.

What difficulty level is this interview question?

This is a medium difficulty Machine Learning question, commonly asked during Technical Screen rounds at Amazon.

What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Amazon during technical interviews.

Compare Regularization Techniques and Their Use Cases

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of model evaluation metrics (precision and recall), regularization techniques (L1, L2, L0, L∞), and regression fundamentals including ordinary least squares assumptions and contrasts between linear and logistic regression, assessing competencies in statistical reasoning, model selection, and interpretation of predictive models. Commonly asked in the Machine Learning domain for data scientist roles to probe reasoning about evaluation trade-offs, effects of regularization on coefficients and optimization, and the conceptual versus practical implications of model assumptions, it examines both conceptual understanding and practical application.

Amazon

Jul 12, 2025, 6:59 PM

Data Scientist

Technical Screen

Machine Learning

Technical Phone Screen: Model Evaluation, Regularization, and Regression Basics

Instructions

Answer the following, focusing on clarity and practical intuition suitable for a predictive analytics/data science interview.

Questions

Precision and Recall
- Define precision and recall using TP, FP, FN.
- When would you prioritize precision vs. recall? Give brief examples.
Regularization Comparison
- Compare L1, L2, L0, and L∞ regularization: effect on coefficients, optimization properties, and common use cases.
Linear Regression Assumptions
- List the key assumptions behind ordinary least squares (OLS) linear regression.
Model Formulas and Contrast
- Write the formulas for linear regression and logistic regression, including the link functions and typical loss functions.
- Contrast the two models in terms of outputs, assumptions, estimation, and evaluation.

Solution

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