Explain why data cleansing is essential and which method you use to maintain clean data?
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What education is required for data science role?
Explain systematic sampling?
What is cart and chaid?
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?
You have two tables-the first table has data about the users and their friends, the second table has data about the users and the pages they have liked. Write an SQL query to make recommendations using pages that your friends liked. The query result should not recommend the pages that have already been liked by a user.
Explain reinforcement learning.
Are expected value and mean value different?
Define linear regression?
Explain the difference between data modeling and database design?
What is the difference between a bagged model and a boosted model?
Who can be scientific data there are three general steps to becoming a data scientist?
Define a sql query? What is the difference between select and update query? How do you use sql in sas, python, r languages?
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