Question

Calculate coefficient of correlation using the following data.

X:	-3	-2	-1	1	2	3
Y:	9	4	1	1	4	9

Answer 1

X	X2	Y	Y2	XY
-3	9	9	81	-27
-2	4	4	16	-5
1	1	1	1	-1
1	1	1	1	1
2	4	4	16	8
3	9	9	81	27
\(\sum\)x = 0 N = 6	\(\sum\)x2 = 28	\(\sum\)y = 28 N= 6	\(\sum\)y2 =196	\(\sum\)xy =0

= 0 (There is no correlation between the variables x and  y)