Example 1
n
X
X2
Y
Y2
XY
n
5
3
n
7
4
n
1
1
n
6
3
n
9
5
n
9
5
n
10
7
n
4
3
n
3
2
n
2
2
n
·
X
·
Y
n
N =
n
SD
X
r =
n
SD
Y
r
2
=
n
b =
n
a =
n
Ŷ = a + bX
