9231 P41 - Jun 2021 - Q2 - 7 marks
6792
A driving school employs four instructors to prepare people for their driving test. The allocation of people to instructors is random. For each of the instructors, the following table gives the number of people who passed and the number who failed their driving test last year.
| Instructor 1 | Instructor 2 | Instructor 3 | Instructor 4 | |
|---|---|---|---|---|
| Passed | 72 | 42 | 52 | 68 |
| Failed | 33 | 34 | 41 | 58 |
Test at the 10% significance level whether success in the driving test is independent of the instructor.
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