Find r, for two variables X and Y of n = 10, Ix-)(y-7) = 800, 0, = 10, 0, = 12
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Given that: n=10
∑x=50,∑y=−30
∑x
2
=290,∑y
2
=300,
∑xy=−115
Formula :
=
n∑x
2
−(∑x)
2
.
n.∑y
2
−(∑y)
2
n∑xy−∑x.∑y
r=
10×290−(50)
2
.
10×300−(−30)
2
[10×(−115)]−[50×(−30)]
=
2900−2500
.
3000−900
−1150+1500
=
400
.
2100
350
=
20×10
21
350
=
4
21
7
=0.381.
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