1. The following dataset has three data points with two attributes (also called features), f1 and f2:

	f1	f2
a	1	0
b	10	10
c	1	2

Which two points are closest when proximity is measured using cosine?

A. b and c

B. a and b

C a and C

2. Let vector u=(10,10), Which of the following is the unit length transformation of u?

		(1, 1)
		(0, 1)
		(1/sqrt(2), 1/sqrt(2)), or approximately (0.707, 0.707)
		(0.5, 0.5)

3.

Let u=(1, 0, 1), v=(0, 1, 0). What is the dot product of u and v?

		0
		1
		sqrt(2)
		3