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www.psychlotron.org.uk
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Name of resource: Confounding variables
Submitted by: Aidan Sammons
Specification details: AQA-B
Other specifications:  All
Guidance: handout explaining the distinction between (non-confounding) extraneous variables and confounding
variables.  An activity requires students to identify a confounding and a non-confounding extraneous
variable from each of two scenarios.  An extension (high demand) activity requires students to link the
concepts of random and systematic error to other features of sound experimental design.