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Data Scientist Interview Questions

"Every business collects data, and it's the job of the data scientist to analyze, interpret, and communicate that information in a way that will help drive company decisions. In an interview, expect to answer technical questions about your ability to perform quantitative tests as well as create clear visualizations of large, complex data sets. Come ready to discuss past projects you've worked on and how you communicate data findings clearly and concisely in order to help solve business-related problems."

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You are compiling a report for user content uploaded every month and notice a spike in uploads in October. In particular, a spike in picture uploads. What might you think is the cause of this, and how would you test it?

2 Answers

Hypothesis: the photos are Halloween pictures. Test: look at upload trends in countries that do not observe Halloween as a sort of counter-factual analysis.

We cannot say what has caused the spike since causal relationship cannot be established with observed data. But we can compare the averages of all the months by performing a hypothesis testing and rejecting the null hypothesis if the F1 score is significant.

How do you take millions of users with 100's of transactions each, amongst 10k's of products and group the users together in a meaningful segments?

3 Answers

Find the second largest element in a Binary Search Tree

16 Answers

How would you build and test a metric to compare two user's ranked lists of movie/tv show preferences?

2 Answers

How would you test if survey responses were filled at random by certain individuals, as opposed to truthful selections?

2 Answers

The three data structure questions are: 1. the difference between linked list and array; 2. the difference between stack and queue; 3. describe hash table.

1 Answer

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?

31 Answers

Write a function that takes in two sorted lists and outputs a sorted list that is their union.

10 Answers

generating a sorted vector from two sorted vectors.

3 Answers

How do you test whether a new credit risk scoring model works? What data would you look at?

2 Answers
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