Calculate Karl Pearson'* co-efficient of correlation for the following data using deviation method.
| X | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 28 | 30 | | Y | 36 | 33 | 30 | 27 | 24 | 21 | 18 | 15 | 12 |
= -402/404
= -0.996