What can a defendant in a federal case do if he or she is unhappy with a trials outcome?

 The correct answer is : Appeal the decision

Explanation:   An appeal is not a new trial. In case the defendant does not plead guilty in the trial, he will have the right to appeal the sentence, as long as the judge who gave his verdict in the trial has made a legal error. The defendant must have a valid and justified reason to appeal. It is not easy to win an appeal, it is serious and can not be appealed simply because there was no pleasure in the sentence, it is necessary to verify that the court made an error that caused damage or prejudice.

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