1. how to normalize data
2. how to detect outlier, what is IQR?
3. how to reverse a list in python
4. how to insert a number in a list in python
5. how does spark's rdd work? how is it diffrent from pyspark's dataframe?
6. how to calculate cumulative sums in a table in sql
7. what is the difference between mapreduce and in-memory?
8. what is mapreduce?
9. what is lag?
10. proceeding and in sql?
11. how to count number of data points in a numpy array?
12. how to do hyperthesis test?
13. what is false positive rate? what is false negative rate?
14. how to delete duplicates in a dataframe in python?
15. what is false discovery rate? and bonferroni correction?
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