Types of Experiment

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  • Types of Experiment
    • Lab
      • An experiment conducted in a specially Designed and controlled environment. The IV is manipulated to observe the effect of DV.
        • + Have high control over extraneous variables. Means that researchers can ensure that any effect on the DV is likely to be the result of manipulation of the IV therefore has high internal validity.
        • + replication is more possible due to high control levels. ensures new extraneous variables arent introduced when repeating experiment. it is vital to measure validity.
        • - May lack generalisability. Behaviour may not be normal as in an unfamiliar setting- low external validity
        • - Tasks carried out may not represent real life experience- low mundane realism.
    • Natural
      • An experiment that takes advantage of the fact that the IV varies naturally, so we can observe the effects of this on the DV
        • + Provide opportunities for research that may not otherwise be undertaken for practical or ethical reasons.
        • + High external validity because they involve the study of real life issues as they happen.
        • + Naturally occurring events can be rare, reducing opportunities for research
        • - Ps may not be randomly allocated to experimental conditions. It means the researcher might be less sure whether the IV affect the DV
    • Field
      • An experiment conducted in more natural surroundings, IV directly manipulated by experimenter to observe effect on DV. Some control
        • + Higher mundane realism than lab experiments as the environment is more natural
        • + May produce behaviour that is more valid and authentic especially if Ps are unaware that they're being studied
        • - There is a loss of control of extraneous variables. Means cause and effect between the IV and DV in them may be more difficult to establish and precise replication is often not possible.
        • - Ethics:If Ps are unable they're being studied they can't consent to it and research might constitute an invasion of privacy
    • Quasi
      • The IV is naturally occurring and is the difference between people that exists.
        • + Carried out under controlled conditions so it ensures new extraneous variables aren't introduced when repeating an experiment.
        • - Cannot randomly allocate Ps conditions and therefore may be confounding variables.

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