Answer :
An ordinal or ratio scale can be used to record the variable income: You may define five groups of salaries and code the incomes that belong to each group from 1 to 5 on an ordinal scale. You would record specific amounts for income at the ratio level.
Differences between qualitative and categorical data
The differences between qualitative and categorical data are:
A qualitative variable, often known as a categorical variable, is one in which the variable categories are expressed verbally rather than as sets of numbers. Nominal and ordinal are the two subtypes of categorical data. Nominal variables lack numerical values in favor of "names."
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