How can you extract all items from a NumPy array that are greater than 5?

If `arr` is a 1-dimensional NumPy array, what will `arr[::2]` do?

Which of the following will raise an error?

How do you calculate the dot product of two arrays `a` and `b`?

How do you get the unique values from a NumPy array `arr`?

Which method can be used to find the indices of non-zero elements in a NumPy array?

Ready to try your hand at data science? This course is designed to challenge your existing knowledge and hands-on skills, ensuring you are fully prepared for any twists and turns a data science interview might present. We'll push your understanding of critical topics to the limit, assessing your readiness for real-life scenarios.

Let's take a look at what we'll be working with in this course. The first section will acquaint you with Python, a flexible and advanced programming language known for its clear syntax and readability.

NumPy is a fundamental library in Python that facilitates efficient numerical computations with powerful n-dimensional arrays and mathematical functions.

Pandas provides intuitive and versatile data structures for efficient data manipulation and analysis, streamlining the initial stages of the data science pipeline.

Matplotlib is a comprehensive Python library for creating static, animated, and interactive visualizations in Python.


Seaborn is a Python data visualization library based on Matplotlib that provides a high-level interface for creating informative and attractive statistical graphics.

Statistics provides data scientists with foundational techniques and tools to extract meaningful insights from data, allowing them to make informed decisions and predictions based on empirical evidence.

Scikit-learn is an open-source Python library that provides simple and efficient tools for data analysis and modeling, particularly for machine learning. Data scientists use it extensively for its comprehensive collection of algorithms and processing techniques, enabling them to quickly develop and deploy predictive models.

Theoretical Questions

1. What will the following code output:

2. What does the following code do:

3. How can you extract all items from a NumPy array that are greater than 5?

4. What is the result of the following:

5. If `arr` is a 1-dimensional NumPy array, what will `arr[::2]` do?

6. Which of the following will raise an error?

7. How do you calculate the dot product of two arrays `a` and `b`?

8. How do you get the unique values from a NumPy array `arr`?

9. Which method can be used to find the indices of non-zero elements in a NumPy array?