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Data Science Interview Questions
Questions Answers Views Company eMail

What is the difference between select and update query?

 99

What is association analysis?

 100

How do you do for loops in python and r?

 119

What is data science? How would you say it is similar or different to business analytics and business intelligence?

 87

What is an outlier? How do you treat outlier data?

 78

What is column storage?

 110

How is random forests different from decision trees?

 105

Name some kinds of graphs and explain how you would build them in python or r.

 101

How do you do data import in sas?

 94

What is churn? How would it help predict and control churn for a customer?

 114

Which package is used to do data import in r and python? How do you do data import in sas?

 104

What is clustering? What is the difference between kmeans clustering and hierarchical clustering?

 109

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

 105

How do you use lambda in python?

 100

What is the difference between kmeans clustering and hierarchical clustering?

 117

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Un-Answered Questions { Data Science }

Can you explain the difference between a validation set and a test set?

94

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

111

What do you understand by term hash table collisions?

87

Explain how to merge the files into a single dataframe?

127

Define the term cross-validation

89




Why do we need generators in Python?

115

Can you explain data cleansing?

91

What makes scientific data?

116

What skills do I need to be a data scientist?

116

Differentiate between skewed and uniform distribution?

109

What cross validation technique would you use on time series data set? Is it k-fold or loocv?

88

What is cart and chaid?

110

What are outlier values and how do you treat them?

90

Explain eigenvalue and eigenvector

100

What is overfitting?

96

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