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Top 24 Data Science Interview Questions and Answers

27/Aug/2021 | 10 minutes to read


Here is a List of essential Data Science Interview Questions and Answers for Freshers and mid level of Experienced Professionals. All answers for these Data Science questions are explained in a simple and easiest way. These basic, advanced and latest Data Science questions will help you to clear your next Job interview.

Data Science Interview Questions and Answers

These questions are targeted for Data Science Professionals. You must know the answers of these frequently asked Data Science interview questions to clear a Data Scientist Interview. We have written separate documents for Artificial Intelligence and Machine Learning interview questions.

1. What is Data Science?

2. How does Machine learning and Artificial Intelligence relate to Data Science?

3. What roles and responsibilities does a Data Scientist hold in an Organization?

4. Which is bigger in the left skew - mean or median?

5. How to handle Class Imbalanced problems? What are various approaches to handle class imbalanced problems?

6. How will you choose the number of clusters in k means?

7. How will you reduce the number of variables in random forest and logistic regression?

8. How does gradient descent work in Machine Learning?

9. How to implement random forest?

10. Explain some dimensionality reduction techniques.

11. How to implement Tensorflow?

12. What is a dependent variable in regression?

13. Does the dependent variable in regression need to be normally distributed?

14. What is Regularization?

15. What are the common assumptions of linear regression?

16. When will you prefer AUC curve over accuracy?

17. Explain the relationship between Accuracy, Precision and AUC.

18. What is the Sigmoid function?

19. Give examples of applications of data science concepts and techniques.

20. What is Overfitting and Underfitting with Machine learning algorithms?

21. How to determine the optimal number of clusters for k-means?

22. How is CNN different from other neural networks? When will you use it?

23. Explain Data Science life cycle in detail.

24. What are the top programming languages for Data Science?

There are many common programming languages used for Data Science.

Some General Interview Questions for Data Science

1. How much will you rate yourself in Data Science?

When you attend an interview, Interviewer may ask you to rate yourself in a specific Technology like Data Science, So It's depend on your knowledge and work experience in Data Science.

2. What challenges did you face while working on Data Science?

This question may be specific to your technology and completely depends on your past work experience. So you need to just explain the challenges you faced related to Data Science in your Project.

3. What was your role in the last Project related to Data Science?

It's based on your role and responsibilities assigned to you and what functionality you implemented using Data Science in your project. This question is generally asked in every interview.

4. How much experience do you have in Data Science?

Here you can tell about your overall work experience on Data Science.

5. Have you done any Data Science Certification or Training?

It depends on the candidate whether you have done any Data Science training or certification. Certifications or training are not essential but good to have.


We have covered some frequently asked Data Science Interview Questions and Answers to help you for your Interview. All these Essential Data Science Interview Questions are targeted for mid level of experienced Professionals and freshers.
While attending any Data Science Interview if you face any difficulty to answer any question please write to us at Our IT Expert team will find the best answer and will update on the portal. In case we find any new Data Science questions, we will update the same here.