2 A large number of students are taking a Physics course. They are assessed by a practical examination and a written examination. The marks out of 100 obtained by a random sample of 15 students in each of the examinations are as follows.
| Student | A | \(B\) | C | D | \(E\) | \(F\) | \(G\) | H | I | J | \(K\) | \(L\) | \(M\) | \(N\) | \(O\) |
| Practical examination | 66 | 63 | 24 | 52 | 59 | 76 | 88 | 51 | 48 | 36 | 91 | 72 | 68 | 67 | 60 |
| Written examination | 63 | 57 | 39 | 50 | 47 | 71 | 87 | 65 | 56 | 39 | 78 | 70 | 61 | 62 | 70 |
Use a sign test, at the \(10 \%\) significance level, to test whether, on average, the practical examination marks are higher than the written examination marks.