Question detail
Why should reaction-time trials be repeated?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The human nervous system
Question
- A. To improve reliability and spot unusual results
- B. To make the nervous system stop responding
- C. To remove the need to calculate a mean
- D. To change the dependent variable each time
Answer
The correct option is To improve reliability and spot unusual results. This is the best answer because it directly matches the learning objective to apply safe and valid practical design to reaction-time investigations, including control variables, repeats and calculation of mean values.
Explanation
The correct option is To improve reliability and spot unusual results. To improve reliability and spot unusual results supports the answer because it fits Structure and function in The human nervous system and uses the required AQA GCSE Biology context. The objective asks students to apply safe and valid practical design to reaction-time investigations, including control variables, repeats and calculation of mean values, so the explanation must connect the option to that exact skill or idea. The other options are incorrect because "To make the nervous system stop responding", "To remove the need to calculate a mean", "To change the dependent variable each time" do not match the specific approved objective or practical context.
Common mistake
Ignoring Control Variables
Students often forget to identify and control variables that could affect the outcome of their reaction-time investigations.
Ensure to list all potential variables and explain how you will keep them constant throughout the experiment.
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