They are otherwise called one tail hypotesis, unlike non directional hypothesis, they actually tell what direction a researcher's hypothesis goes.. For an example.. Using the topic, differnce between the scores of students in psy111 and their scores in psy112. A directional hypothesis like I said not only says their would be a significant relationship, but tell you the dirrection.. Eg. Students will perform better in psy111 than in psy 112 is an example of a directional hypothesis, their would be a significant difference in scores in psy1111 and psy112 is a nondirectional hypothesis, while a null hypothesis would say that teir is no significant difference between the both scores. Browse to learn more