types of experiments

what are the 4 types of experiments

lab

field

quasi

natural

features of a lab

-highly controlled conditions with standardised procedure

-IV is manipulated to see the effect on DV

-pps is aware of experiment and aim

strength and weakness of lab

:) high levels of control = low likelihood that extraneous variables interfere with DV so can establish cause and effect relationship

:) easily repeatable so high reliability

:( high likelihood of demand characteristics

features of field

-in pps normal everyday environment

-IV is manipulated to see effect on DV

-pps not aware of experiment or aim

strength and weakness of field

:) reduces likelihood of demand characteristics

:) high mundane realism

:( lack of control over extraneous variables affecting DV

features of quasi

-can occur in a lab or field setting

-IV cannot be manipulated as it is naturally occurring between PEOPLE

e.g. age, gender

strength and weakness of quasi

:) can study pps variables allowing comparison between people

:( IV is not manipulated high likelihood of extraneous variables affecting DV

features of natural experiment

-can occur in lab or field setting

-IV cannot be manipulated as it is a naturally occurring EVENT/ change in the environment

e.g. hospitalisation at young age

strength and weakness of natural

:) enables research which otherwise would be unethical to manipulate

:( IV is not manipulated high likelihood of extraneous variables affecting DV