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Investigation Design ­ Aims and Hypotheses
Aim = intended purpose of an investigation

Hypothesis = a specific statement of what the psychologist wants to test e.g. alcohol makes people
more aggressive

Null Hypothesis = the IV will not have any effect on the DV e.g. alcohol will not have an…

Page 2

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External validity = the extent to which findings can be generalised to settings other than the
research settings. Population validity ­ whether the findings can be generalised to other people.
Ecological validity ­ whether the results can be generalised to other settings.

*Different methods are used to measure validity, such…

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