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

Data Science Interview Questions

Questions Answers Views Company eMail

How do you handle missing values in python or r?

308

What is a document database?

397

Define a sql query? How do you use sql in sas, python, r languages?

386

Why do you need a for loop? How do you do for loops in python and r?

343

What is random forests and how is it different from decision trees?

303

What is a z test?

358

Why do you need a for loop?

325

How would churn help predict and control churn for a customer?

291

Where linear optimization is used?

409

What is an api? What are apis used for?

326

What is logistic and linear regression? Name some packages in r and python for building regression models.

330

What is t test?

326

What is the travelling salesman problem?

291

Define a sql query? What is the difference between select and update query?

362

what is json and what is xml?

330

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Un-Answered Questions { Data Science }

What is an Eigenvalue and Eigenvector?

337

Explain calculate distance methods briefly?

313

You are given two tables- friend_request and request_accepted. Friend_request contains requester_id, time and sent_to_id and request_accepted table contains time, acceptor_id and requestor_id. How will you determine the overall acceptance rate of requests?

342

Can you explain the difference between a Test Set and a Validation Set?

327

In any 15-minute interval, there is a 20% probability that you will see at least one shooting star. What is the probability that you see at least one shooting star in the period of an hour?

476

How would you create a taxonomy to identify key customer trends in unstructured data?

394

Which database is best for data science?

321

Is 8gb ram enough for data analysis?

391

What is the advantage of performing dimensionality reduction before fitting an svm?

299

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

425

What is the 80/20 rule?

331

What kind of product you want to build at LinkedIn?

306

Explain supervised learning?

326

How make you 3d plots/visualizations using numpy/scipy?

391

What are applications of ggplot2?

374

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