Final answer:
Eye color is measured on a nominal scale because it is qualitative data and the categories do not have a logical order.
Step-by-step explanation:
The variable eye color is measured on a nominal scale, which is one of the four levels of measurement. The nominal level of measurement is used for qualitative (categorical) data that cannot be logically ordered. Examples of nominal level data include categories, colors, names, labels, and favorite foods.
In the case of eye color, the categories (for example, blue, brown, green) do not have a natural order, and you cannot say that one color is 'higher' or 'better' than another in the same way you can with numbers. Thus, when determining the level of measurement for the variable eye color, the correct answer is the nominal scale.