exercises Statistics

Use Pearson correlation in all these exercises.

In these exercises, use n instead of n -1. These samples are not closed.

1. In this table there are values for two variables x and y. (n = 6)

i x y

1 1 2.5

2 3 3

3 4 6

4 6 5

5 7 7.5

6 8 8

Calculate correlation r.

2. x y

3 2

4 5

6 5

11 12

Calculate correlation r.

3. x y

50 3

10 0

40 3

20 1

30 2

20 2

Calculate correlation r.

4. x y

36 2

33 1

43 3

29 0

Calculate correlation r.