Calculate the correlation coefficient between X and Y and comment on their relationship:
| X | –3 | –2 | –1 | 1 | 2 | 3 |
| Y | 9 | 4 | 1 | 1 | 4 | 9 |
X | Y | XY | X2 | Y2 |
–3 | 9 | –27 | 9 | 81 |
–2 | 4 | –8 | 4 | 16 |
–1 | 1 | –1 | 1 | 1 |
1 | 1 | 1 | 1 | 1 |
2 | 4 | 8 | 4 | 16 |
3 | 9 | 27 | 9 | 81 |
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As the value of r is zero, so there is no linear correlation between X and Y