1. Give two variables the students controlled in their investigation - AQA - GCSE Biology - Question 7 - 2018 - Paper 1
Question 7
1. Give two variables the students controlled in their investigation.
1
2
2. What is the reading shown in Figure 9?
Reading on ruler =
cm
3. Circle the anomal... show full transcript
Worked Solution & Example Answer:1. Give two variables the students controlled in their investigation - AQA - GCSE Biology - Question 7 - 2018 - Paper 1
Step 1
Give two variables the students controlled in their investigation.
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Answer
Drop the ruler from the same height.
Use the same hand each time.
Step 2
What is the reading shown in Figure 9?
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Answer
The reading on the ruler is approximately 8 cm.
Step 3
Circle the anomalous result in Table 2 for Student A.
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Answer
The anomalous result for Student A in Table 2 is '2'.
Step 4
What is the median result for Student B?
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Answer
The median result for Student B is 12.
Step 5
Calculate the value of X in Table 2.
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Answer
The mean distance ruler dropped is 11 cm.
Step 6
Calculate how much faster the reaction time of Student A was compared to Student B.
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Answer
To calculate how much faster, we use the values from Figure 10 and Table 2. Assuming Student A's reaction time was 0.15 s and Student B's was 0.12 s, the difference is 0.03 s, meaning Student A's reaction time was slower by this amount.
Step 7
Give one conclusion about the effect of caffeine on reflex actions.
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Answer
Caffeine speeds up reflex actions, as shown by the lower mean distance ruler dropped when caffeine was administered.
