Which of the following can be treated as an interval-ratio variable?
A)social security number
B)zip code
C)age
D)hair color

Question

Quizplus · Accepted Answer

Interval-ratio variables are variables that have a meaningful order and equal intervals between values, and also have a true zero point. Age fits this definition, as it has a meaningful order (e.g., someone who is 40 years old is older than someone who is 30 years old), equal intervals between values (e.g., the difference between being 30 and 40 years old is the same as the difference between being 40 and 50 years old), and a true zero point (i.e., being born represents a score of zero on the age variable). Social security number and zip code are nominal variables, and hair color is also nominal or ordinal, depending on how it is measured.

Which of the Following Can Be Treated as an Interval-Ratio