Five students measured their reaction times without a phone and while talking on a phone.
Table
| Student | A | B | C | D | E |
|---|---|---|---|---|---|
| Reaction time without phone in s | 0.21 | 0.19 | 0.24 | 0.20 | 0.22 |
| Reaction time while talking on phone in s | 0.27 | 0.25 | 0.23 | 0.29 | 0.26 |
Which conclusion is best supported by the data?
Talking on a phone increased the mean reaction time, but not for every student.
Talking on a phone increased the reaction time of every student who was tested.
Talking on a phone decreased the mean reaction time by a little more than 0.050.050.05 s.
Talking on a phone had no effect, because one student reacted faster when talking.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.