Post #2400

📊 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! 💬React with ❤️ for more!