Data Science Interview Questions

There’s no doubt that data science is one of the most lucrative jobs. With the advancement of technology, there are various opportunities available for those who are interested information technology field. The increase in demand in the data science field has led many individuals to pursue this career. And as a result, a lot of professionals are there in the field of data science.

To surpass the crowd, you must also possess the necessary skills and abilities. Skills and knowledge are an essential parts, but there is one more thing for which you should be well prepared, and that is the interview part. Your answers are critical in impressing the interview committee, which plays an important role in getting you your dream job. 

Also Read: Which Language Is Best for Machine Learning?

It is essential to prepare for the interview well in advance so that you do not panic on the day. So in this reading, you will have all the essential interview questions that are asked during the recruiting process. We have also mentioned a suitable answer for the questions that you can either curate according to your suitability, or you can give the same answer as the one mentioned. Find out the difference between data science and data analytics to know what you should choose.

Q1. What do you understand by Data Science? 

This is one of the most common but most critical questions, many people sit for the interview but do not have even the basic knowledge of what their job is about. This is a great chance to show that you have in-depth knowledge about your subject. 

Answer: Data science consists of various scientific processes, algorithms, tools, and ML techniques to identify a common pattern and collect the information from the raw data. 

Q2. What is the difference between data analytics and data science?

You are applying for a role in data science, and there is a difference between the two. The most common blunder in this is that candidates say that they are in the same field. You can do it by choosing a master’s in data management course. 

Answer: In Data science, we transform the data using various tools and methods to extract necessary insights. 

Data analytics involves checking the existing info and answering questions for a better and more effective business-related decision process.

Here onwards, the questions are the ones that will test your technical knowledge in data science. 

Q3. Can you tell me some techniques used for sampling?

Answer: Two techniques used for sampling are: Probability Sampling Technique and Non-Probability Sampling Technique. Data science is not something that can be done at a time. Data samples help to represent the whole population and perform analysis on it. 

Q4. There are some conditions for overfitting and underfitting. What are those?

Answer: For overfitting, the data perform well only for the sample training data. If we give in new data, we won’t be able to get any results. 

For underfitting: the model is so simple that it fails to identify the right relationship in the data, and therefore, it does not perform well on the test data. 

Q5. Is there any difference between the expected value and mean value?

Answer: There is not much difference between expected and mean values, but we have to note that these are used in different contexts. The mean value generally refers to distribution in probability, whereas the expected value is referred to when it involves random variables. 


Cracking through the interview process can be a little bit difficult as a fresher. But as you will gain experience, it won’t be much difficult. The questions above are not the only ones that will be asked of you, but these are the most frequently asked ones. The pro tip for answering the questions in the best way is to answer them in the shortest way possible, remember you are not giving a test, you are giving an interview, keep it short, simple, and relevant.

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