### CFA Practice Question

Mike Buscher is developing a survey to gauge investors' perceptions of their stockbrokers. He is developing a scale to measure the differences between their perceptions and assumes that perceptions, such as satisfactory and dissatisfactory service, differ by the same amount. Which of the following measurement scales would suffice?
A. Ordinal
B. Nominal
C. Interval
Explanation: An interval scale would be sufficient since Mike assumes that perceptions differ by a constant amount. He is not interested in assessing the ratio of perceptions.

### User Contributed Comments6

User Comment
gdeng1 Shouldn't this be ordinal?
egghead they differ by the same amount. That's a feature of interval scale
JCopeland I thought Ordinal as well, but you make no assumptions about the degree of difference between variables. We only assume that certian variables are better, higher ranking, etc than others. Interval scale makes the assumption that the differences are constant.
chandsingh Tricky as he made the assumption so i thought it had to be verifiable