Independent groups- different participants in each condition.
Repeated measures- same participants used.
Matched pairs- different participants but are matched on key variables to form pairs.
Directional- they predict a specific outcome.
Non- directional- they predict a change or difference, but dont state what that is.
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Inter rater reliability- compare results with other people.
Test-retest reliability- same group of people do the experiment again.
Internal Validity- the extent to which a study measures what it is designed to.
external validity- can the findings be generalised to other settings?
situation variables- time of day, temperature, noise etc.
participant variables- age, gender, skill etc.
investigator effects- behaviour and lamguage of the investigator
participant effects- they search for cues for how to behave in the experiment
quantitative data- numbers- how much of something you have
qualitative data- measured in words- narrative form
measures of dispersion- the range and standard deviation.
content analysis- how common something is, e.g making catergories from qualititative data.