The best answer for this is that the proper level of
measurement here is ordinal. This is because these possible survey responses are given
in order, but do not really have set number values associated with
them.
Ordinal data are ones that have some natural order
(rank order) to them. In this case, good is clearly not as good as better and best is
above both of those.
These categories cannot really be
deemed to be interval data because there is no exact interval between them. We do not
know how much "better" is above "good" and we do not know how much "best" is above
"better." So we cannot give these exact number equivalents. Therefore they are not
interval data.
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