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Skill readiness test

AI/ML Engineer – RAG Pipeline Development at SimVentions, Inc - Glassdoor ✪ 4.6

3 questions, about 3 minutes. This is a diagnostic, not a certification — it estimates your skill readiness, it does not guarantee you are qualified for or will be hired into this role.

1. What does `df.groupby('region')['sales'].sum()` return?
2. Which AWS service is primarily used for scalable object storage?
3. Which library is most commonly used for tabular data manipulation in Python?