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A cognitive psychologist wants to determine how people learn to play the piano. The psychologist observes one practice session for each of the subjects each week, for a total of six months. He writes down the length of the practice session, the number of breaks in the practice session, and whether the subject prefers to practice classical, popular or jazz music. At the end of the six months, he asks the teacher to rate the quality of the playing of all of the students on a 1-to-7 scale. The psychologist wants to determine if practice habits effect playing quality (they all have the same piano teacher). What level of measurement is the teacher's rating?
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