Fixed 1 -- amended a misspelling that wasn't caught.

As for 2, if I'm understanding you correctly, the predicted grade should update if the instructor sets a prediction. But I'm not sure what you mean by the instructor version of the assignment list -- you mean this code here?

```haml
          - if current_user.is_staff?
            = render partial: 'students/predictor/instructor_assignments', collection: current_course_data.by_assignment_type.to_a, as: :assignment_type_and_assignments
          - elsif current_user.is_student?
            = render partial: 'students/predictor/assignments', collection: current_course_data.by_assignment_type.to_a, as: :assignment_type_and_assignments
```