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Psychology unit 4 research methods revision

Types of investigation

Lab experiment: an experiment is where 2 groups are compared to see if there is a
difference. The IV is altered directly by the experimenter. All other extraneous
variables are tightly controlled. The DV is observed and recorded.

+high internal validity-…

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Psychology unit 4 research methods revision

Case study: small group of participants that are studied in high amounts of detail.
These are usually longitudinal studies which are when the study occurs over a long
period of time.

+high ecological validity as it is a real life example so can be…


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