Question

X 7 4 5 3 2 10

Answer 1

Solution: We are required to find the correlation between x and y here:

The formula for correlation is:

$r=\frac{n\sum x y- \sum x \sum y}{\sqrt{[n\sum x^{2}-(\sum x)^2][n\sum y^{2}-(\sum y)^2]}}$

       $=\frac{6\times 159- 31 \times 18}{\sqrt{[6 \times 203-(31)^2][6 \times 258-(18)^2]}}$

       $=\frac{396}{560.8636}$

       $=0.7061$

$\therefore r=0.7061$

Hence the option A. 0.7061 is correct