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10 cards from this deck
Factors not studied but can influence results, causing noise.
To ensure results reflect true relationships, not interference.
Noise from building work outside during testing.
Use noise-cancelling headphones or soundproof rooms.
Hospital environment, noise, room temp, participant anxiety.
Noise, temperature, lighting, location.
Think about environmental and participant factors.
All variables except the one being tested.
Unwanted factors like noise that affect results, e.g., traffic noise.
Use soundproof rooms or noise-cancelling devices.
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