9231 P41 - Jun 2020 - Q2 - 7 marks
6816
The times, in milliseconds, taken by a computer to perform a certain task were recorded on 10 randomly chosen occasions. The times were as follows.
| 6.44 | 6.16 | 5.62 | 5.82 | 6.51 | 6.62 | 6.19 | 6.42 | 6.34 | 6.28 |
It is claimed that the median time to complete the task is 6.4 milliseconds.
(a) Carry out a Wilcoxon signed-rank test at the \(5 \%\) significance level to test this claim.
(b) State an underlying assumption that is made when using a Wilcoxon signed-rank test.
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