Question
Following is the distribution of marks (out of 25) obtained by 10 students in Physics and Mathematics.
| No. | Physics (Xi ) | Mathematics (Yi ) |
|
|
|
| 1 | 18 | 21 | 324 | 441 | 378 |
| 2 | 20 | 23 | 400 | 529 | 460 |
| 3 | 11 | 14 | 121 | 196 | 154 |
| 4 | 20 | 23 | 400 | 529 | 460 |
| 5 | 14 | 17 | 196 | 289 | 238 |
| 6 | 15 | 18 | 225 | 324 | 270 |
| 7 | 13 | 16 | 169 | 256 | 208 |
| 8 | 16 | 19 | 256 | 361 | 304 |
| 9 | 17 | 20 | 289 | 400 | 480 |
| 10 | 20 | 23 | 400 | 529 | 460 |
| Total | 164 | 194 | 2780 | 3854 | 3412 |
Draw a scatter diagram for all the 10 students and calculate the correlation between marks of Physics and Mathematics.
Answer :
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Skip in 10
For the ten students the paired values ((X_i , Y_i)) are ((18,21),(20,23),(11,14),(20,23),(14,17),(15,18),(13,16),(16,19),(17,20),(20,23)). When these points are plotted on a graph with Physics on the X-axis and Mathematics on the Y-axis, all the points lie close to a rising straight line from left to right, showing a strong positive association between the
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