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?

164

What is a document database?

232

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

214

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

186

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

145

What is a z test?

191

Why do you need a for loop?

167

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

163

Where linear optimization is used?

180

What is an api? What are apis used for?

177

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

178

What is t test?

175

What is the travelling salesman problem?

158

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

208

what is json and what is xml?

179

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Un-Answered Questions { Data Science }

Please explain the goal of a/b testing.

187

What is supervised learning?

171

What is the central limit theorem?

188

Please explain eigenvectors and eigenvalues?

152

What is logistic and linear regression?

177

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

176

What is meant by R statistics?

163

What is column storage? What is a document database?

196

How do you treat multicollinearity and heteroscedasticity in regression?

174

What is advantage of using apply family of functions in r?

186

Which objects are iterated in python?

192

What are Important things to remember for ggplot?

184

What is churn?

180

How do you take millions of users with 100's of transactions each, amongst 10000's of products and group the users together in a meaningful segments?

271

Explain data preparation?

154

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