Which of the following is an example of a ratio scale?

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BlackTom AI · Accepted Answer

Question: Which of the following is an example of a ratio scale?
Option 1: Ranking university students by their performance in a course
This represents an ordinal scale, where order matters but differences between ranks are not necessarily equal or meaningful. It does not satisfy the properties of a ratio scale, which requires a true zero and meaningful equal intervals.
Option 2: Classifying university students by their blood type (e.g., A, B, AB, O)
This is a nominal scale, where categories are labels without any inherent order or ranking. There is no quantitative distance or true zero; thus not a ratio scale.
Option 3: Measuring the time it takes (in seconds) for university students to complete an exam
This is a classic example of a ratio scale. It has ordered values with equal intervals, and a true zero point (zero seconds means no time elapsed). All arithmetic operations (differences, ratios) are meaningful on this scale.
Option 4: Measuring temperature in Celsius during an exam in university
Celsius temperatures are on an interval scale. They have equal intervals, but there is no true zero that represents the absence of temperature (zero does not mean ‘no temperature’ in an absolute sense). Therefore, it is not a ratio scale.

2025/26/1 PSYB19-104 1 - Basics of Research Methods Exam (16 December, 11:00)

Which of the following is an example of a ratio scale?

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