Classify each operational variable below as nominal, ordinal, interval, ratio (or scale).
a. Degree of pupil dilation in a person’s eyes in a study of romantic couples (measured in millimeters)
b. Number of books a person owns.
c. A book’s sales rank on amazon.com
d. The language a person primarily speaks at home.
e. Nationality of the participants in a cross-cultural study of Canadian, Ghanaian, and French students.
f. A student’s letter grade in school.
g. Narcissism as operationally defined using the Narcissistic Personality Inventory (NPI – Raskin & Terry, 1988). This 40 question survey counts the number of statements selected associated with narcissism and provides a single score ranging from 0 – 40, with a higher score indicating greater levels of narcissism.
h. The question “If you were given the chance, would you reapply to your current job?” Options: Yes or No
i. The question “Do you have fun at work?” using a sliding scale akin to Likert. People are shown all numbers 1 – 10 like in Likert, but instead of having to select a solid value, the participant can “slide” a bar anywhere on that range.