If the scores 100, 120, and 140 are scores on an interval scale, which statement is true?
A) The score of 120 represents a 20% increase over the score of 100.
B) The score of 140 represents as much increase over 120 as 120 does over 100.
C) Both (a) and (b) are true.
D) Neither (a) nor (b) is true.

Question

Quizplus · Accepted Answer

Interval scales have equal intervals between values, so the difference between 120 and 100 is the same as between 140 and 120. However, percentage increase calculations are not valid on interval scales.

If the Scores 100, 120, and 140 Are Scores on an Interval