If the standard deviation statistic is used,what must the level of measurement of the variable be?

Question

Quizplus · Accepted Answer

The standard deviation statistic requires interval level of measurement or higher, as it involves calculating the deviation from the mean which requires subtraction and addition of values on a continuous scale. Nominal and ordinal levels of measurement do not allow for such mathematical operations, while ratio level adds the possibility of including a true zero point to the scale.

If the Standard Deviation Statistic Is Used,what Must the Level