If you want to do train-test-validate split, then in scikit-learn you will

Not call train_test_split() function

call train_test_split() function once

call train_test_split() function twice

call train_test_split() function three times

In a regression model, if a categorical attribute has 4 levels, you will end up having how many dummy variables?

1

2

3

4

The entropy of a set of 52 different playing cards? H(cards)

0.1 bits

2.0 bits

5.7 bits

3.58 bits

The Euclidean distance between two data points (3, 4) and (2.75, 6) is

2.015

2.001

3.022

1.999