📊 15 Data Analyst Interview Questions for Freshers (with Answers)

⦁ Who is a Data Analyst?
Ans: A professional who collects, processes, and analyzes data to help organizations make informed decisions.

⦁ What tools do data analysts commonly use?
Ans: Excel, SQL, Power BI, Tableau, Python, R, and Google Sheets.

⦁ What is data cleaning?
Ans: The process of fixing or removing incorrect, corrupted, duplicate, or incomplete data.

⦁ What is the difference between data and information?
Ans: Data is raw, unorganized facts. Information is processed data that has meaning.

⦁ What are the types of data?
Ans: Qualitative (categorical) and Quantitative (numerical), further split into discrete and continuous.

⦁ What is exploratory data analysis (EDA)?
Ans: A technique to understand data patterns using visualization and statistics before building models.

⦁ What is the difference between Excel and SQL?
Ans: Excel is good for small-scale data analysis. SQL is better for querying large databases efficiently.

⦁ What is data visualization?
Ans: Representing data using charts, graphs, dashboards, etc., to make insights clearer.

⦁ Name a few types of charts used in data analysis.
Ans: Bar chart, Line chart, Pie chart, Histogram, Box plot, Scatter plot.

⦁ What is the difference between INNER JOIN and OUTER JOIN?
Ans: INNER JOIN returns only matched rows; OUTER JOIN returns matched + unmatched rows from one or both tables.

⦁ What is a pivot table in Excel?
Ans: A tool to summarize, sort, and analyze large data sets dynamically.

⦁ How do you handle missing data?
Ans: Techniques include removing rows, filling with mean/median, or using predictive models.

⦁ What is correlation?
Ans: A statistical measure that expresses the extent to which two variables are related.

⦁ What is the difference between structured and unstructured data?
Ans: Structured data is organized (e.g., tables); unstructured is not (e.g., text, images).

⦁ What are KPIs?
Ans: Key Performance Indicators – measurable values that show how effectively objectives are being achieved.

💡 Tip: Be clear with your basics, tools, and communication!

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