Experiments

• experiments?

  * have IV and DV

  * sometimes extraneous variables, sometimes they're controlled (not controlled in natural experiment)
• + of experiments?

  * bc IV is manipulated it's possible to establish cause and effect

  * method is objective bc highly controlled

  * lab experiments are most reliable bc little extraneous variables

  * field experiments have high ecological validity as ppts are in their normal setting

  * natural experiments allow experimenters to investigate IVs that would be otherwise difficult to set up
• (-) of experiments?

  * low construct validity as DV usually measure in narrow way

  * often suffer from demand characteristics, especially if ppts know they're being studied

  * lab experiments often use artificial environments that don't relate to real life so low construct validity

  * field experiments have many extraneous variables

  * natural experiments also have many extraneous variables