The correct order of the scales of measurement, from least precise to most precise, is:

The correct order of the scales of measurement, from least precise to most precise, is:

• A. Nominal, Ordinal, Interval, Ratio
• B. Ordinal, Nominal, Ratio, Interval
• C. Ratio, Interval, Nominal, Ordinal
• D. Nominal, Ordinal, Interval, Ratio

Answer: (D)

Levels of measurement determine what you can say about data and how precise your comparisons can be. The order from least precise to most precise is: nominal, ordinal, interval, ratio. Nominal data simply classify into categories without any inherent order or equal spacing. You can count categories, but you can’t say one category is higher or lower than another. Ordinal data introduce a rank order, so you know which values are larger or smaller, but the gaps between ranks aren’t guaranteed to be equal. Interval data establish equal distances between values, so you can talk about exact differences, but there is no true zero point, which means ratios aren’t meaningful. Ratio data build on interval properties and add a true zero, allowing meaningful statements about both differences and ratios. This sequence is why the given option is correct: it respects that true zero and equal intervals differentiate ratio from interval, and that both are more informative than ordinal and nominal.

Levels of measurement determine what you can say about data and how precise your comparisons can be. The order from least precise to most precise is: nominal, ordinal, interval, ratio. Nominal data simply classify into categories without any inherent order or equal spacing. You can count categories, but you can’t say one category is higher or lower than another. Ordinal data introduce a rank order, so you know which values are larger or smaller, but the gaps between ranks aren’t guaranteed to be equal. Interval data establish equal distances between values, so you can talk about exact differences, but there is no true zero point, which means ratios aren’t meaningful. Ratio data build on interval properties and add a true zero, allowing meaningful statements about both differences and ratios.

This sequence is why the given option is correct: it respects that true zero and equal intervals differentiate ratio from interval, and that both are more informative than ordinal and nominal.