A ratio scale allows you to compare differences between numbers.

• A. Perception
• B. Ratio data scale
• C. Primary data
• D. Qualitative data

Answer: (B)

Understanding measurement scales helps you see what numbers really mean. A ratio scale has ordered values with equal intervals and a true zero point. That combination makes it possible to compare differences and to form meaningful ratios. For instance, if one quantity is 6 and another is 3, you can say the difference is 3 and the first value is twice the second. This ability to talk about both differences and multiples comes from the true zero and equal spacing on a ratio scale. The other options aren’t numeric scales with those properties: perception isn’t a numeric scale, primary data is a collection method, and qualitative data are categories without consistent intervals. So the ratio data scale best fits the statement.