| Sources | Fo | Fe | Fo − Fe | (Fo − Fe)2 | (Fo − Fe)2/Fe |
| Little Extent | 5 | 20 | −15 | 225 | 11.25 |
| Great Extent | 75 | 20 | 55 | 3025 | 151.25 |
| Not affected | 0 | 20 | −20 | 400 | 20 |
| No response | 0 | 20 | −20 | 400 | 20 |
| TOTAL | 80 |
|
|
| 202.5 |