Create a hypothesis to state what you intend to demonstrate or show through the research study. If a correlational study, what variables are you going to show relationship between. A hypothesis statement for a correlational study could be, "Through this research, I will demonstrate a strong, positive relationship between x and y."
If an experimental study, what is your independent and dependent variables? This knowledge will eventually lead to what extraneous variables will have to be controlled. A hypothesis statement for an experimental study could be, "The group that went through treatment A will perform better than the group that went through treatment B."