Answer this scenario:

A statistics instructor at a liberal arts college has noticed that psychology and sociology students seem to have more positive attitudes toward statistics compared with history and English students. The professor administers the Statistics Attitudes Inventory (SAI) scale to all students on the first day of the fall semester. The inventory contains twenty Likert-scale items with responses ranging from Strongly Disagree to Strongly Agree. The responses of psychology, sociology, English, and history students are then compared to determine if there are significant differences in attitudes among the four groups of students.

What scale level is the variable "attitude" on?

Nominal

Ordinal

At least interval (scale)