| Andrea is the manager of a company which makes mobile phone chargers. |
| In the past, she had found that \(12 \%\) of all chargers are faulty. |
| Andrea decides to move the manufacture of chargers to a different factory. |
| Andrea tests 60 of the new chargers and finds that 4 chargers are faulty. |
| Investigate, at the \(10 \%\) level of significance, whether the proportion of faulty chargers has reduced. |
| [7 marks] \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) \(\_\_\_\_\) |