Data Science Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Data Science Interview Questions

Questions Answers Views Company eMail

In a given day, how many birthday posts occur on Facebook?

Facebook,

399

Write the code to reverse a Linked list.

WalMart,

382

How will you overcome overfitting in predictive models?

388

Implement a sorting algorithm for a numerical dataset in Python.

Facebook,

327

Will Uber cause city congestion?

Uber,

384

How will you decide which version (Version 1 or Version 2) of the Surge Pricing Algorithms is working better for Uber ?

Uber,

342

What is the good measure of influence of a Twitter user?

Twitter,

279

A building has 100 floors. Given 2 identical eggs, how can you use them to find the threshold floor? The egg will break from any particular floor above floor N, including floor N itself.

Facebook,

412

What assumptions does linear regression machine learning algorithm make?

WalMart,

323

You have 2 dices. What is the probability of getting at least one 4? Also find out the probability of getting at least one 4 if you have n dices.

Facebook,

463

How will you design a recommendation engine for jobs?

LinkedIn,

319

How will you test a machine learning model for accuracy?

287

If we added one rider to the current SF market, how would that affect the existing riders and drivers?

Uber,

351

What would you add to Facebook and how would you pitch it and measure its success?

Facebook,

346

How will you test that there is increased probability of a user to stay active after 6 months given that a user has more friends now?

Facebook,

492

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Un-Answered Questions { Data Science }

What skills do you need to be a data analyst?

310

I have a string “contact@dezyre.com”. Which string function can be used to split the string into two different strings “contact@dezyre” and “com” ?

334

Can you explain data preparation?

310

How will you explain JOIN function in SQL to a 10 year old ?

345

What is nosql? Name some examples of nosql databases.

336

What is reinforcement learning?

287

You can roll a dice three times. You will be given $X where X is the highest roll you get. You can choose to stop rolling at any time (example, if you roll a 6 on the first roll, you can stop). What is your expected pay-out?

296

Define an algorithm to discover when a person is starting to search for new job.

333

Write the code to sort an array in numpy by the nth column?

308

What is the goal of the clustering?

291

A disc is spinning on a spindle and you don't know the direction in which way the disc is spinning. You are provided with a set of pins.How will you use the pins to describe in which way the disc is spinning?

409

During analysis, how do you treat missing values?

374

Please explain recommender systems along with an application?

303

What are interpolation and extrapolation?

306

You own a clothing enterprise and want to improve your place in the market. How will you do it from the ground level ?

280

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