Addition and subtraction are completely justified only when variables are
A)dependent.
B)nominal.
C)ordinal.
D)interval-ratio.

Question

Quizplus · Accepted Answer

Addition and subtraction are only fully justified when dealing with interval-ratio variables. Interval-ratio variables have equal intervals between categories and have a true zero point, which allows for meaningful mathematical operations such as addition and subtraction. Nominal and ordinal variables do not have a numerical value and therefore cannot be added or subtracted, and dependent variables are not a type of measurement scale.

Addition and Subtraction Are Completely Justified Only When Variables Are