06 Some students investigated the effect of drinking caffeine on reaction time.
They used a drink containing 32.25 mg of caffeine per 100 cm
This is the method used.
1. Divide the students into four groups, A, B, C and D.
2. Measure and record the reaction time of each student using the ruler-drop test.
3. Students in:
• group A drink 200 cm of water
• group B drink 200 cm of the caffeine drink
• group C drink 400 cm of the caffeine drink
• group D drink 600 cm of the caffeine drink.
4. Repeat step 2 after 15 minutes.
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6
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Describe how to do the ruler-drop test.
[3 marks]

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