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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 first sum the differences for all five participants:
Next, we divide this sum by the number of participants:
ext{Mean Difference} = rac{-0.035}{5} = -0.007
Since the question asks for the answer in milliseconds, we multiply by 1000:
Thus, the mean difference in reaction time is -7 ms.
Step 2
Give two improvements the manufacturer would need to make to this investigation.
Answer
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Increase the sample size: By testing a larger number of participants, the manufacturer can obtain more reliable data that better reflects the overall effect of the drink on reaction time.
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Control environmental factors: Ensuring that all tests are conducted under similar conditions (e.g., same time of day, same testing environment) will help to minimize external variables that could affect reaction times.