Discussion
A variable 'Academic Achievement' will be measured on ..................... .
Answer: B
Academic achievement is measured on an interval scale.
Achievement test scores are treated as interval data: the difference between 40 and 50 marks is taken to equal the difference between 60 and 70, so means and standard deviations can be computed. But there is no true zero, since a score of zero does not mean an absence of all achievement.
That lack of a true zero rules out the ratio scale (a student with 80 does not know twice as much as one with 40). The nominal scale only names categories, and the ordinal scale only ranks, which loses the score information.
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