1. What is A/B Testing?
  2. What is Cluster Sampling?
  3. Name a few libraries in Python used for Data Analysis and Scientific Computations.
  4. How are NumPy and SciPy related?
  5. What is the main difference between a Pandas series and a single-column DataFrame in Python?
  6. How can you handle duplicate values in a dataset for a variable in Python?
  7. How do you map nicknames (Pete, Andy, Nick, Rob, etc) to real names?
  8. Is rotation necessary in PCA? If yes, Why? What will happen if you don’t rotate the components?
  9. Why is naive Bayes so ‘naive’ ?
  10. How is kNN different from kmeans clustering?
  11. How is True Positive Rate and Recall related? Write the equation.
  12. When is Ridge regression favorable over Lasso regression?
  13. While working on a data set, how do you select important variables? Explain your methods.
  14. What is the difference between covariance and correlation?

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