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Define Extraneous Variable?
Anything else that may affect the dependant variable and give an unreliable results
List the extraneous variables
Investigator Affects- Expectations and body language. Double blind procedures and standardise instructions
Situation Variables- Time of day/ setting
Control enviorment
Partcipant Variables- Individual Differences
Randomise the groups
Demand Characterstics- the way people think they are supposed to behave , single blind procedure , or decieve them (unethical)
Order Effects- the order in which tasks happen in. Counter balancing
Describe a field experiment?
Out in everyday social situations
ADV- Greater ecological validty ( more accurate behaviour)
No Demand Characterstics
Dis- Little Control
Hard to reproduce
Ethical Issues fully informed consent
EXAMPLES-> Behaviour on a train with one man holding a bottle of alcohol and one with a walking stick. unethical
Describe the Repeated Measures Design?
SAME group, SAME task, DIFFERENT conditions.
No individual differences
Less participants needed
Order effects
Demand Characteristics
Describe the experimental Design?
2 groups, 2 different conditions, same test
No order affcets
Less chance of guessing aims
Individual Differences
Twice as many participants needed
Describe Matched Pairs Design?
Two seperate groups,one condition , matched for characterstics.
Reduces individual differences
Time consuming
Give an example of a Experimental Design?
Matched pairs, Repeated Measures, Experimental Design.
Give an example of a research method?
Natural, Field, Lab,
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