Psychology

• Experimental method


  • Directional = more/less/higher/lower
  • Non-dictional = Difference not specified
• Directional


  When a theory or findings of previous research studies suggest an outcome
• Non-directional


  No previous research
• IV


  A researcher changes or manipulates
• DV


  Variable that is measured
• Levels of IV


  Need a comparison = compare
• Operationalisation


  Clearly defining variables in terms of how they can be measured
• Extraneous variables


  Any variable, excl IV, that may affect DV if not controlled
• Confounding variables


  Type of extraneous variable - Any event that could affect the ppt before they take part in the study, that would have a direct influence on the study