WASH (Water, Sanitation, and Hygiene) Officer Question:

These are variables that may be measured quantitatively and that can take an infinite number of values. The most commonly used continuous variables in social science are interval variables. In interval scales, differences between two values are meaningful and equivalent. For example, the difference between 100 and 90 and the difference between 90 and 80 are identical. In interval variables, there is no absolute zero value. Examples of interval scales include attitude and opinion scales requiring an individual to express a level of agreement regarding a statement such as "My husband wants me to wash my hands before I cook."