A business colleague who is new to Hadoop approaches you with a question. The colleague wants to know the best approach to access their data. The colleague has previously worked extensively with SQLand databases.
Which query interface should be recommended?

In a Logistic Regression, the coefficient for "age" equals -3.
What is the correct interpretation of the Logistic Regression coefficient, holding all other variables constant?

You are given 10, 000, 000 user profile pages of an online dating site in XML files, and they are stored in HDFS. You are assigned to divide the users into groups based on the content of their profiles.
You have been instructed to try K-means clustering on this data. How should you proceed?

You are provided with the following list.
Which window function is missing?
cume_dist()
dense_rank()
rank()
percent_rank()
first_value()
last_value()
lag()
lead()
ntile()

How is HDFS defined?