Research issues

• Define ‘EV’

  Any variable other than the IV that may affect the DV if it is not controlled, they do not vary systematically with the IV
• Define ‘confounding variable’

  A kind of EV that varies systematically with the IV so it can’t be concluded whether the change is DV is due to the IV or confounding variable
• Define ‘demand characteristic’

  Any cue from the researcher or research situation that may be interpreted by the ppts as revealing the purpose of the investigation causing a change in behaviour
• Define ’investigator effects’

  Any effect the investigators behaviour (conscious or unconscious) on the DV
• Define ‘randomisation’

  The use of chance methods to control for the effects of bias
• Define ‘standardisation’

  Using exactly the same formalised procedures and instructions for all ppts in a research study