4. Calculate the coefficient of correlation from the following data:
N =10,X = 55.7 = 4,8X2 = 385.LY? =192.2(X+Y)2 =947
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Answer:
Correct option is
B
−0.68
n=10,
∑x=55,
∑x
2
=385,
∑(x+y)
2
=947 ∑y=40,
∑y
2
=192,
∑(x
2
+y
2
+2xy)=947
(∑x
2
+∑y
2
+2∑xy)=947
385+192+2∑xy)=947
∑xy=185
r=
(n∑x
2
−∑x
2
)(n∑y
2
−∑y
2
)
n∑xy−(∑x×∑y)
=
(10×385−55
2
)(10×192−40
2
)
10×185−55×40
=−0.68
Step-by-step explanation:
I I wish this is my correct answer
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