Directional ( one-tailed )

• States the kind of difference or relationship expected between two conditions or groups of participants
• E.g People who do homework without the TV produce better results than those who do do homework with the TV on
• if the study is looking for a relationship you must not say better or worse. You must say there is a positive or negative correlation between…
• When you carry out a statistical test because you have one outcome in mind you use a one tailed test
• You chose a directional when there is previous research so that you know what to expect