Variable A is measured on an interval scale with values that range from 0 to 10. Which of the following statements must be true?
A)The value 0 represents the complete absence of variable A.
B)The value 8 represents twice the amount of variable A as does the value 4.
C)The difference in the amount of A from 2 to 3 is the same as the difference from 6 to7.
D)All the above statements are true.

Question

Quizplus · Accepted Answer

Interval scales allow for the measurement of the magnitude of difference between points, but they do not have a true zero point that indicates the absence of the variable being measured. Therefore, statement C is correct because it accurately reflects that the interval scale measures consistent differences between values. Statements A and B are incorrect because A assumes a true zero point which interval scales do not necessarily have, and B incorrectly applies the properties of a ratio scale (which has a true zero and allows for the comparison of magnitudes in the way described) to an interval scale.

Variable a Is Measured on an Interval Scale with Values