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Psychology unit 4 research methods
Internal validity- how much the experiment is testing what it is supposed to be
Extraneous variables- affect the internal validity
- Situational- temperature, instructions, time of day
- Participant- intelligence, age, gender
- Demand characteristics- reduced using a single blind design
(participant doesn't know the aim of the study)
- Investigator effects- reduced by using a double blind design
(participant and investigator don't know the real aim of the
External validity- accuracy of generalising findings to other situations
Ecological validity- the artificial setting of a lab experiment alter the
behaviour of the participants so that in real life they may have behaved
Population validity- if the sample is biased then it won't represent the
target population and the results won't be able to be generalised to the
whole target population


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