Final answer:
The correct answer to the question of which variable is nominal is Color. Nominal variables represent categories without any intrinsic ranking or order, and color is the only option that fits this description.
Therefore, the correct answer is c) Color.
Step-by-step explanation:
The question is asking to identify which variable among the given options is a nominal variable. A nominal variable is a type of variable that is used to label categories without any quantitative value. This means that nominal variables describe data that fits into categories, but you cannot rank or order the categories.
Among the options provided:
- Salary is usually a ratio variable because it can be ordered, it has a meaningful zero point (meaning that zero salary indicates no salary), and the difference between values is meaningful.
- Ranking is an ordinal variable as it implies a sort of order, like 1st, 2nd, 3rd, and so on.
- Color is a nominal variable because it represents categories without any intrinsic ranking. For example, the color blue is not higher or lower than the color red.
- Score is typically an interval variable if we are talking about scores on a scale, or ratio if the scoring has a true zero point and the distance between scores is meaningful.
Therefore, the correct answer is c) Color.