Controlling extraneous variables

Cards (9)

  • Give three ways a researcher can control for extraneous variables.
    • (C)ounterbalancing
    • Random allocation
    • (S)ingle blind
    • (D)ouble blind
    • (R)andomisation
    • (St)andardisation
  • What is a demand characteristic?
    Any cue from the researcher or the situation that may be interpreted by participants as revealing the purpose of the investigation.
  • What is an investigator effect?
    Any effect of the investigators behaviour (conscious or unconscious) on the dependent variable.
  • What can investigator effects include in terms of the investigators behaviour?
    The selection of or interaction with participants during the research process.
  • What can investigator effects lead to?
    Participants changing their behaviour within the research situation.
  • What can be introduced to overcome investigator effects and demand characteristics?
    Double blind trails
  • What can be done to eliminate demand characteristics?
    Single blind or double blind trails
  • What can be done to eliminate investigator effects?
    Double blind trail
  • What would happen in a drug trail which uses double blind trails.
    Both the participant and the researcher don't know who has the placebo or the real drug.