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Find the coefficient of correlation for the following: 

Cost (Rs) 14 19 24 21 26 22 15 20 19
Sales (Rs) 31 36 48 37 50 45 33 41 39

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X Y x= X - \(\bar{X}\)
= X - 20
y = Y - \(\bar{Y}\)
= Y - 40
x2 y2 xy
14 31 -6 -9 36 81 54
19 36 -1 -4 1 16 4
24 48 4 8 16 64 32
21 37 1 -3 1 9 -3
26 50 6 10 36 100 60
22 45 2 5 4 25 10
15 33 -5 -7 25 49 35
20 41 0 1 0 1 0
19 39 -1 -1 1 1 1
180 360 0 0 120 346 193

Correlation coefficient 

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