lab experiment

• • Lab experiment :  conducted in a highly  controlled environment . Researchers can manipulate the IV and record the effect  of the DV .  PPts randomly allocated to condition .
• strengths :

  • High control over extraneous variables  → cause and effect established 
  • Replication is possible due to high level of control
  • Reliability 
• weakness:

  • Ppts aware of testing → demand characteristic / social desirability 
  • Artificial environment : lack generalisability
  • Investigator effect may occur unless double blind