The standard deviation would be an appropriate measure of variability only if the variable is measured on:
A)nominal and ratio scales.
B)ordinal and nominal scales.
C)interval and ratio scales.
D)optimal and interval scales.

Question

Quizplus · Accepted Answer

Standard deviation can only be calculated for variables measured on interval and ratio scales because it requires numerical values with equal intervals between them. Nominal and ordinal scales only provide categorical data without a sense of numerical distance between categories. Optimal scale is not a known type of measurement scale.

The Standard Deviation Would Be an Appropriate Measure of Variability