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The reaction time of five people was tested using a computer - Edexcel - GCSE Biology Combined Science - Question 5 - 2020 - Paper 1
Question 5
The reaction time of five people was tested using a computer. These people were then given 100 cm³ of a liquid to drink. Their reaction times were recorded 10 minu... show full transcript
Worked Solution & Example Answer:The reaction time of five people was tested using a computer - Edexcel - GCSE Biology Combined Science - Question 5 - 2020 - Paper 1
Step 1
Calculate the mean difference in reaction time.
Answer
To calculate the mean difference in reaction time, we add up all the differences and then divide by the number of people.
The differences are:
-0.011, -0.002, -0.009, -0.006, -0.007.
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Calculate the sum of the differences:
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Divide by the number of values (5):
ext{Mean} = rac{-0.035}{5} = -0.007
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Convert to milliseconds (1 second = 1000 milliseconds):
Thus, the mean difference in reaction time is -7 ms.
Step 2
The drinks manufacturer wants to advertise the effect of the drink on reaction time.
Answer
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Increase the sample size to include a larger group of participants, which would help to enhance the reliability and generalizability of the findings.
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Conduct a control trial where one group consumes the drink and another group consumes a placebo to ensure the effects observed are due to the drink itself.