Controlling extraneous variables (Edexcel GCSE Statistics): Flashcards
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What are extraneous variables?
What are extraneous variables?
Factors not studied but can influence results, causing noise.
Why is controlling extraneous variables important?
Why is controlling extraneous variables important?
To ensure results reflect true relationships, not interference.
Example of extraneous variable in memory test?
Example of extraneous variable in memory test?
Noise from building work outside during testing.
How can noise be controlled in an experiment?
How can noise be controlled in an experiment?
Use noise-cancelling headphones or soundproof rooms.
What is an extraneous variable in the sleep study?
What is an extraneous variable in the sleep study?
Hospital environment, noise, room temp, participant anxiety.
Common extraneous variables include?
Common extraneous variables include?
Noise, temperature, lighting, location.
What exam tip helps identify extraneous variables?
What exam tip helps identify extraneous variables?
Think about environmental and participant factors.
What should good experimental design keep constant?
What should good experimental design keep constant?
All variables except the one being tested.
Define extraneous variables with an example.
Define extraneous variables with an example.
Unwanted factors like noise that affect results, e.g., traffic noise.
Name a practical control method for external noise?
Name a practical control method for external noise?
Use soundproof rooms or noise-cancelling devices.