Which of the following is a ratio variable?

Question

BlackTom AI · Accepted Answer

To determine the type of each variable, we need to classify data by measurement level: nominal, ordinal, interval, or ratio.
Option 1: Zip code. This is a nominal variable, since it names a category (a location) without any intrinsic order or numeric meaning beyond labeling.
Option 2: Annual household income. This is a ratio variable. It has a true zero point (income can be zero), the numbers have meaningful ratios (e.g., double income is twice as much), and arithmetic operations like multiplication and division are meaningful.
Option 3: Level of agreement on a 1–5 scale. This is an ordinal variable. The numbers indicate order (strongly disagree to strongly agree), but the intervals between points are not guaranteed to be equal or meaningful, so we cannot assume equal distances.
Option 4: Favorite color. This is another nominal variable, since colors are categories without inherent order or quantitative meaning.
In summary, among the options, the one that best fits a ratio level is the variable representing annual household income, due to its true zero point and meaningful ratios, while the others fall into nominal or ordinal categories with different interpretive limits.

Which of the following is a ratio variable?

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