What is the primary goal of data science?

• To visualize data in charts

• To store data in databases

• To extract knowledge from data

• To create complex algorithms

Which of the following is NOT a component of data science?

• Web Development

• Statistics

• Data Engineering

• Domain Expertise

What is data wrangling?

• The process of visualizing data

• The process of cleaning and organizing data

• The process of analyzing data

• The process of storing data

Which Python library is primarily used for data manipulation?

• NetworkX

• SciPy

• Pandas

• Matplotlib

What does the term 'missing data' refer to?

• Data that is not relevant

• Data that is corrupted

• Data that is not available

• Data that is duplicated

Which of the following is a method for detecting missing values in a pandas DataFrame?

• replace()

• fillna()

• dropna()

• isnull()

What is the purpose of feature selection?

• To visualize data

• To improve model accuracy and reduce time complexity

• To clean the data

• To reduce the size of the dataset

Which of the following tools is used for data visualization?

• Excel

• All of the above

• Tableau

• R

What is the role of a Data Scientist?

• To develop software applications

• To analyze data and provide insights

• To create marketing strategies

• To manage databases

Which library is commonly used for machine learning in Python?

• NumPy

• Matplotlib

• Pandas

• Scikit-learn