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Extraneous variable
A variable that may have an effect on the DV if not controlled
Demand characteristics
A cue from the researcher that could cause the participant to change behaviour
Investigator effects
The effect the investigators behaviour has on the outcome
What are the different research issues?
Randomisation
Investigator effects
Demand characteristics
Extraneous variables
Standardisation
Randomisation
Use of chance methods to control the effects of bias
Standardisation
Using exact same procedures for all participants