From the application description, Administrators manage users, job positions, and committees, so it sounds like they're just application admins that manage the entire system (i.e. managing users, adding/removing job positions, adding reviewers to the committee of job positions, etc.) In turn the administrators do not have any involvement in the database level besides being one of the user types, and they do not have any relationship connections with the other entities. Is this correct?

I'm don't quite get the question.

Administrators are just a type of user in the system, just like applicants are also a type of user.

"Manage" refers to operations, which will be implemented in future assignments with controllers & views & so on. In this assignment you just need to design the models.

And don't worry about access control (i.e. which type of users can perform what operation) either. We'll cover that when we get to the security part.

In data/model design, you just need to be able to tell which user is an admin/reviewer/applicant and that's enough.

but you still need tell at least one thing that admin can do right? 

otherwise the relationship database table will be empty