With which of the four scales of measurement did you associate the following measures?

Question

Your year of birth.
Your marks in secondary school.
Your shoe size and width.
The number of the row in which you sat during the last lecture (from front to back).
Your income last month.

Answer 1

Your year of birth. (Interval: The differences between adjacent years are equal, but our system of keeping track of the number of years does not have a true zero.)
Your marks in secondary school. (If the marks simply indicate the number of items answered correctly, then the marks are ratio in scale. They have a true zero as well as equal intervals between adjacent marks.)
Your shoe size and width. (Ordinal: It is not clear that adjacent shoe sizes all have the same difference in either length or width. But it is possible that the intervals are equal. There does not appear to be a true zero with respect to shoe size, thus the scale cannot be ratio.)
The number of the row in which you sat during the last lecture (from front to back). (Ordinal: Assuming that the rows are numbered from front to back, they do indicate the relative distance from the front of the room. Also, if the rows are equally spaced, then the numbers would be on a ratio scale with a true zero.)
Your income last month. (Ratio: Dollars, pounds, euros are all equal interval in scales. Furthermore, it is possible that you had no income last month.)