2 Four pairs of randomly chosen twins were each given identical puzzles to solve. The times taken (in seconds) are shown in the following table.
| Twin pair | 1 | 2 | 3 | 4 |
| Time for first-born | 46 | 38 | 44 | 49 |
| Time for second-born | 40 | 41 | 37 | 46 |
Stating any necessary assumption, test at the \(10 \%\) significance level whether there is a difference between the population mean times of first-born and second-born twins.