Final answer:
The federal judiciary has three tiers, which include the Supreme Court with one chief justice and eight associate justices, the Circuit Courts of Appeals, and the District Courts.
Step-by-step explanation:
The federal judiciary of the United States has three tiers. These are the Supreme Court at the top, the Circuit Courts of Appeals in the middle, and the District Courts at the base. The Supreme Court consists of one chief justice and eight associate justices. In addition, Congress has also established specialized courts such as bankruptcy courts and immigration/naturalization courts, but these do not alter the three-tier structure of the federal court system.