Otherwise, I am not quite sure I understand how turn out is used in the sentence. According to dictionaries, when turn out is used as intransitive verb, it means 'appear', which doesn't make sense in the context, as it means 'predictions appear'.
Some beginning researchers mistakenly believe that a good hypothesis is one that is guaranteed to be right (e.g., alcohol will slow down reaction time). However, if we already know your hypothesis is true before you test it, test- ing your hypothesis won’t tell us anything new (as Einstein said, “A person who never made a mistake never tried anything new”). Remember, research is supposed to produce new knowledge. To get new knowledge, you, as a researcher–explorer, need to leave the safety of the shore (established facts) and venture into uncharted waters (as Einstein said, “If we knew what we were doing, it would not be called research, would it?”). If your predictions about what will happen in these uncharted waters is wrong, that’s okay: Scientists are allowed to make mistakes (as Bates said, “Research is the pro- cess of going up alleys to see if they are blind”). Indeed, scientists often learn more from predictions that do not turn out than from those that do.