Question
Calculate the correlation coefficient from the following data and interpret it.
| X | 9 | 7 | 6 | 8 | 9 | 6 | 7 |
| Y | 19 | 17 | 16 | 18 | 19 | 16 | 17 |
| X | 9 | 7 | 6 | 8 | 9 | 6 | 7 |
| Y | 19 | 17 | 16 | 18 | 19 | 16 | 17 |
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| I.Q. | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 |
| Number Of Student | 41 | 52 | 64 | 180 | 67 | 45 | 40 | 11 |
| Mid value | 25 | 75 | 125 | 175 | 225 | 275 |
| Frequency | 10 | 70 | 80 | 100 | 150 | 90 |
(i) x + 2y – z = 5, 2x – y + z = 1, 3x + 3y = 8