Types of experiment Flashcards
Lab experiment
Define
Controlled conditions
Researcher manipulates the IV
Researcher measures the DV
Lab experiment
Evaluation- positive
Easy to establish a cause and effect relationship between the IV and the DV.
High internal validity- the observed change will be caused by the IV.
These studies can be easily replicated.
Lab experiment
Evaluation- Negative
They could lack ecological validity- cant be applied to real world situations
Tasks could lack mundane realism
Participants could change their behaviour due to demand characteristics.
Field experiment
Define
Natural conditions
Researcher manipulates IV
Researcher manipulates DV
Feild experiment
Evaluation- positives
Participants will behave more naturally so higher ecological validity
Tasks will have more mundane realism.
Participants will not show demand characteristics.
Feild experiment
Evaluation- Negative
Lack of control over Extrenous variables on the DV.
An increase in particpant variables could effect the DV reducing internal validity.
Natural experiment
Define
Natural conditions
IV is naturally occurring (unemployment/ an earthquake)
Researcher measures the DV
Rutter- Romania study (abandoned children)
Natural Experiment
Evaluation- positive
Allows studys to be commited that could not happen anywhere else due to ethcial reasons.
High external validity as its real behavior so free of demands characteristics
Natural experiment
Evaluation- Negative
Reasercher has no control over the groups so extrenous variables cant be controlled- cant claim a Cause and Effect relationship.
These studies cant be replicated to test for reliability
Quasi Experiment
Define
Controlled or Natural conditions
IV is the difference between people (age/gender)
Researcher measures the DV
Quasi experiment
Evaluation- positive
The only way to study factors that are pre-existing
Quasi experiment
Evaluation- negative
Confounding variables cant be controlled so these can effect the IV.
