1. 
Non parametric method:
Less power but more robust.
 Does not assume normal distribution.


Also varies between -1 and 1

2. 
The usual way of writing Spearman Rank
Coefficient is:
Where:
d: differences between the ranks of the two variables
n: number of samples

3. X
4
4
7
25
21
7
Y
16
8
8
20 16 15 12 20 25
8
Solution: Step 1. Ho:
7
17 16
X=Y
9

4. Step 5. Computation of r.
X
Y
Rank X
Rank Y
D
D²
4
16
9.5
4.5
5
25
4
8
9.5
9
-0.5
0.25
7
8
7
9
-2
4
25
20
1
2.5
-1.5
2.25
7
16
7
4.5
2.5
6.25
17
15
3
6
-3
9
16
12
4
7
-3
9
9
20
5
2.5
2.5
6.25
21
25
2
1
1
1
7
8
7
9
-2
4

5. Step 6. Decision: Accept Ho since r = 0.594 is
less than 0.602.
Interpretation: The values of X and Y are not
related.

6. 1. Calculate the correlation between the IQ of a
person with the number of hours spent in front of TV
per week.
IQ
Hours of TV per
week
106
7
86
0
100
27
101
50
99
28
103
29
97
20
113
12
112
6
110
17

7. 1. Calculate the correlation between the IQ of a
person with the number of hours spent in front of TV
per week.
IQ
Hours of TV per
week
106
7
86
0
100
27
101
50
99
28
103
29
97
20
113
12
112
6
110
17