Data Science Interview Questions
Questions Answers Views Company eMail

What is the difference between supervised and unsupervised methods?

199

What is a z test, chi square test, f test and t test?

193

What packages are used for data mining in python and r?

178

What are the various classification algorithms?

189

What is data science? Also, list the differences between supervised and unsupervised learning.

175

A certain couple tells you that they have two children, at least one of which is a girl. What is the probability that they have two girls?

275

List the differences between supervised and unsupervised learning.

208

How does data cleaning plays a vital role in analysis?

263

What is back propagation and explain it’s working.

184

What is the role of activation function?

239

Explain the structure of artificial neural networks?

214

Explain the difference between a validation set and a test set?

178

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?

320

How can you generate a random number between 1 – 7 with only a die?

377

What is the difference between “long” and “wide” format data?

195


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Un-Answered Questions { Data Science }

Who can be scientific data there are three general steps to becoming a data scientist?

176


Describe the various steps involved while carrying out an analytical project?

202


Which one you prefer R or Python for text analytics?

202


A jar has 1000 coins, of which 999 are fair and 1 is double headed. Pick a coin at random, and toss it 10 times. Given that you see 10 heads, what is the probability that the next toss of that coin is also a head?

1296


What is an rdbms? Name some examples for rdbms? What is crud?

165


How can you iterate over a list and also retrieve element indices at the same time?

207


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?

279


Where linear optimization is used?

186


Explain calculate distance methods briefly?

160


What are Principal components?

362


What is difference between sas, r and python programming?

175


How do you do for loops in python and r?

199


What is the job of analytics?

189


Can you cite some examples where a false negative important than a false positive?

192


How do you do data import in sas?

176