Data Science Interview Questions

Welcome to MockInterview.co‘s Data Science Interview Questions library! (300+ questions & growing)

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Data Science Interview Questions › Author "mockinterview"
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What is selection bias, why is it important and how can you avoid it?
MockInterview asked 4 years ago • 
2106 views2 answers0 votes
[Probability] There are 50 cards of 5 different colors. It comprises of 10 Red cards, 10 blue cards, 10 orange cards, 10 green cards and 10 yellow cards. Each color will have the cards numbered between 1 to10. You pick 2 cards at random. What is the probability that they are not of same color and not of same number.
MockInterview asked 4 years ago • 
7035 views5 answers0 votes
What is database index and why do we use it?
MockInterview asked 1 month ago • 
40 views1 answers0 votes
[Facebook data engineer coding] find uncommon words between 2 strings.
MockInterview asked 2 months ago • 
42 views1 answers0 votes
[Facebook data engineer coding] Write a function that, given a string representing a sentence, returns the sentence with the words in the same order but the letter in each word reversed.
MockInterview asked 2 months ago • 
40 views1 answers0 votes
[Facebook SQL data science and data engineer] Evaluate the performance of ads campagins through fill rate
MockInterview asked 2 months ago • 
52 views1 answers0 votes
[Probability] There are four people in a room that haven't met before. They are told to shake hands, exactly once, of every other person in the room so that they all meet each other. If each of these people shake their hands with every other person exactly once then how many handshakes are going to occur?
MockInterview asked 4 years ago • 
2278 views6 answers0 votes
[SQL] use correlated subquery to find all employees whose salary is above average for their department
MockInterview asked 4 months ago • 
117 views2 answers0 votes
You're a data scientist at a prominent logistics company. Your team has estimated that on average the company experiences 0.1 equipment failures per day. What is the most suitable distribution that you could use to model equipment failures for 365 days?
MockInterview asked 4 months ago • 
157 views1 answers0 votes
What does the term 'multiple testing' relate to?
MockInterview asked 4 months ago • 
89 views1 answers0 votes
[Amazon interview] what is the difference between random forest vs cart tree; XGBoost vs RF?
MockInterview asked 6 months ago • 
198 views0 answers0 votes
[Amazon interview] What is a p-value? What are its shortcomings?
MockInterview asked 6 months ago • 
209 views0 answers0 votes
[Amazon Interview] What are the first 3 things you do when given a (clean) dataset and why?
MockInterview asked 6 months ago • 
212 views0 answers0 votes
[Amazon Interview] What are your strengths and weaknesses as a data scientist?
MockInterview asked 6 months ago • 
152 views0 answers0 votes
How would you detect bogus accounts on facebook?
MockInterview asked 4 years ago • 
612 views1 answers0 votes
[SQL] How to keep a nightly count of songs listened by users based on a real-time transaction table. See Description:
MockInterview asked 4 years ago • 
4312 views3 answers0 votes
[SQL] Write an SQL query that makes recommendations using the pages that your friends liked. Assume you have two tables: a two-column table of users and their friends, and a two-column table of users and the pages they liked. It should not recommend pages you already like.
MockInterview asked 4 years ago • 
8766 views6 answers0 votes
[SQL] Given two tables Friend_request (requester_id, sent_to_id , time) Request_accepted (acceptor_id, requestor_id, time) Find the overall acceptance rate of requests.
MockInterview asked 4 years ago • 
6845 views4 answers0 votes
What is the difference between Supervised and Unsupervised machine learning models?
MockInterview asked 2 years ago • 
689 views2 answers0 votes
[Probability] You're about to get on a plane to Seattle. You want to know if you should bring an umbrella. You call 3 random friends of yours who live there and ask each independently if it's raining. Each of your friends has a 2/3 chance of telling you the truth and a 1/3 chance of messing with you by lying. All 3 friends tell you that "Yes" it is raining. What is the probability that it's actually raining in Seattle?
MockInterview asked 4 years ago • 
6508 views5 answers0 votes
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