Answer:
to be able to consider the appeal with an open-mind, not having made the initial decision
Explanation:
The right to appeal is the right someone has to appeal any judicial decision to another court. The appeal means that another court, with independent judges, will review the decision that was made.
In any case, the appeal usually is made because the judge that had already sentenced the case has a view of it, so it is highly unlikely that that judge would change his mind. With the appeal, other judges with other points of view about the case will look into it and maybe have another decision on the case.