A sociologist collects information from high school teachers about their job satisfaction.

For each of the following items, indicate the level of measurement—nominal, ordinal, or interval:
a. What field of study do you teach? Math, Science, Social Studies, English, or Other?
b. How many students do you have in a class?
c. On a five-point scale (from strongly favorable to strongly unfavorable), how do you feel about your work?
d. How many years have you been teaching?