Variables , aims and hypothesis

• Iv- the thing which is manipulated by the investigator.
• DV - what is measured to see if there has been an effect on the IV
• Ev- Something other that Iv which can affect the result
• Types of EV- Situational, Participant and Investigator
• Control Evs through Randomisation and Standardisation.
• Confounding variable- if an Ev not accounted for.
• Demand Characteristics are clues in env, which lead to pp reactivity.
• pp reactivity- screw you or please you effects
• Directional hyothesis (1 t)- sig inc or dec.
• Non - Directional (2t) - sig change
• Null - No change