✅ Top Data Analytics Interview Questions with Answers – Part 2 🧠📊

8️⃣ What is data normalization?
It’s the process of scaling data to fit within a specific range (like 0 to 1) to improve model performance or consistency in analysis.

9️⃣ What are KPIs?
Key Performance Indicators – measurable values used to track performance against objectives (e.g., revenue, conversion rate, churn rate).

🔟 What is the difference between INNER JOIN and LEFT JOIN?
• INNER JOIN: Returns records with matching values in both tables.
• LEFT JOIN: Returns all records from the left table and matched ones from the right (NULLs if no match).

1️⃣1️⃣ What is a dashboard in data analytics?
A visual representation of key metrics and data points using charts, graphs, and KPIs to support decision-making.

1️⃣2️⃣ What are outliers and how do you handle them?
Outliers are data points far from others. Handle them by:
• Removing
• Capping
• Using robust statistical methods
• Transformation (e.g., log)

1️⃣3️⃣ What is correlation analysis?
It measures the relationship between two variables. Values range from -1 to 1. Closer to ±1 means stronger correlation.

1️⃣4️⃣ Difference between correlation and causation?
• Correlation: Two variables move together.
• Causation: One variable *causes* the other to change.

1️⃣5️⃣ What is data storytelling?
It’s presenting insights from data in a compelling narrative using visuals, context, and recommendations.

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