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Observational study
Observational studies are those where the researcher observes a situation and records what happens but does not manipulate an independent variable.Observational studies therefore tend to be high in Ecological Validity as there is no intervention and if the observer remains undetected the method avoids problems with Experimenter effects.
On the other hand observational studies are difficult to replicate.
There are a number of different types of observational studies including non-participant and Participant observations, undisclosed observations and structured and unstructured observations.
