Discussion
The highest level of measurement scale is :
Answer: D
The highest level of measurement is the ratio scale.
Stevens's four levels are nominal (categories), ordinal (order), interval (equal distances) and ratio (equal distances and a true zero). The ratio scale has all the properties of the lower ones plus an absolute zero, so ratios such as 'twice as heavy' are meaningful; weight, height and income are ratio data.
Nominal and ordinal are the lowest levels, and the 'internal scale' (meaning interval) lacks a true zero, so it ranks below ratio.
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