Two students, A and B, investigate how the extension of a spring varies with the applied load force. Each student uses a different set of loads on the same type of spring and the same measuring equipment.

• Table 1 shows the data obtained by Student A.
• Table 2 shows the data obtained by Student B.

Table 1: Student A data $\begin{array}{ccccc}Load\; (N)& Extension\; Trial\; 1\; (mm)& Extension\; Trial\; 2\; (mm)& Mean\; extension\; (mm)& Spring\; constant\; (N/mm)\\ 2& 3& 7& 5& 0.40\\ 3& 5& 9& 7& 0.43\\ 6& 14& 10& 12& 0.50\end{array}$

Table 2: Student B data $\begin{array}{ccccc}Load\; (N)& Extension\; Trial\; 1\; (mm)& Extension\; Trial\; 2\; (mm)& Mean\; extension\; (mm)& Spring\; constant\; (N/mm)\\ 1.0& 1.7& 1.9& 1.8& 0.56\\ 2.0& 3.4& 3.6& 3.5& 0.57\\ 3.0& 5.1& 5.3& 5.2& 0.58\\ 4.0& 6.8& 7.0& 6.9& 0.58\\ 5.0& 8.4& 8.6& 8.5& 0.59\end{array}$

The manufacturer states that the true value for the spring constant of this spring is $0.58N/mm$.