Data Science Interview Questions
Questions Answers Views Company eMail

How do you handle missing values in python or r?

21

What is a document database?

17

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

18




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

18

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

17

What is a z test?

17

Why do you need a for loop?

19

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

17




Where linear optimization is used?

17

What is an api? What are apis used for?

17

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

19

What is t test?

19

What is the travelling salesman problem?

17

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

25

what is json and what is xml?

17


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Un-Answered Questions { Data Science }

What is machine learning? What is the difference between supervised and unsupervised methods?

19


Describe univariate, bivariate and multivariate analysis?

20


Explain how to write a table to a file?

17


How do you build a custom function in python or r?

17


Discuss decision tree algorithm?

15






Pick up a coin C1 given C1+C2 with probability of trials p (h1) =.7, p (h2) =.6 and doing 10 trials. And what is the probability that the given coin you picked is C1 given you have 7 heads and 3 tails?

39


What devices or tools help you most as a data scientist?

21


Name Methods to Calculate Distance Measure?

25


Print the elements of a matrix in zig-zag manner.

15


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

17


What is an example of a data set with a non-gaussian distribution?

21


Explain how to define the number of clusters in a clustering algorithm?

29


Explain the role of activation function?

21


What is cluster sampling?

19


What is the job description for a data scientist?

22