.Data Analysis Essentials: Tools, Techniques, and Applications.

What is the purpose of data cleaning?

• To visualize data
• To correct or remove inaccurate data
• To add random noise
• To sort the data

Which of the following is an example of information?

• 25, Male, Egypt
• "A 25-year-old male from Egypt registered on July 25, 2025."
• Young males are our top users
• Egypt

What does EDA stand for?

• External Data Aggregation
• Enhanced Data Application
• Exploratory Data Analysis
• Essential Data Architecture

What is the output of df.describe() in pandas?

• List of column names
• Null values
• Statistical summary of the dataset
• Data types

Which chart is best for showing distribution of a single variable?

• Pie chart
• Line chart
• Histogram
• Bar chart

Which method is used to merge two DataFrames in pandas?

• pd.concat()
• pd.append()
• pd.merge()
• pd.join()

What does a box plot help detect?

• Average
• Outliers
• Correlation
• Skewness

What is the meaning of high kurtosis?

• Normal distribution
• Symmetric distribution
• Presence of many outliers
• No variation

Which of the following is a type of supervised learning?

• Clustering
• Regression
• Classification
• Association

Which SQL clause is used to filter records?

• SELECT
• WHERE
• GROUP BY
• ORDER BY