9231 P41 - Jun 2020 - Q5 - 10 marks
6819
A large number of children are competing in a throwing competition. The distances, in metres, thrown by a random sample of 8 children are as follows.
| 19.8 | 22.1 | 24.4 | 21.5 | 20.8 | 26.3 | 23.7 | 25.0 |
(a) Assuming that distances are normally distributed, test, at the \(5 \%\) significance level, whether the population mean distance thrown is more than 22.0 metres.
(b) Find a 95% confidence interval for the population mean distance thrown.
Solutions and mark schemes for 9231 are temporarily available to admins only.