A student investigates how the extension of an alloy wire changes as a pulling force is applied. Their results are shown in the table:
| Force (N) | Extension (mm) |
|---|---|
| 0.0 | 0.0 |
| 2.0 | 1.5 |
| 4.0 | 3.0 |
| 6.0 | 4.5 |
| 8.0 | 5.5 |
| 10.0 | 6.2 |
The student writes this conclusion:
"The extension of the wire is directly proportional to the force applied across the entire range of forces tested."
Comment on the student's conclusion. Use data from the table to support your answer.