Quasi Experiment

• Quasi experiment


  conducted in lab/field, Iv not manipulated-occurs naturally, two types:

  natural experiments

  test of difference
• natural experiments 


  naturally occurring IV that has come abt with input from person (e.g. weight, divorce)
• test of difference


  IV is differences between partic that they're born with (e.g. gender, visual ability)
• Strengths


  • conducted when ethically/practically IV can't be manipulated, DV still measured, cause & effect relationship can be inferred

  • internal reliability: consistency in procedures, standardised procedures = replication

  • insight into naturally occurring phenomenon that would be unethical to manipulate = higher mundane relaism = higher eco validity
• Weaknesses


  • cause + effect relationship established, results lower internal validity, limited control of confounding variables (enviro + partic)

  • partic not randomly allocated into groups = quasi isn't true experiment