Hypothesis

• What is a directional hypothesis?


  A hypothesis that predicts the direction of the difference between participant behavior in two conditions.
• What is a non-directional hypothesis?


  A hypothesis that predicts there will be a difference between participant behavior in two conditions but does not specify the direction.
• What is a null hypothesis?

  A hypothesis that predicts there will be no difference between participant behavior in two conditions.
• What is the structure of a non-directional hypothesis?

  There will be a difference in the dependent variable between Condition A and Condition B.
• What is the structure of a directional hypothesis?


  Performance (the dependent variable) will be better in Condition A than in Condition B.
• What is the structure of a null hypothesis?

  There will be no difference in performance (dependent variable) between Condition A and Condition B.