Case number would be nominal scale; the number has no meaning.
interval
ratio
interval
A group, as a single entity, would be nominal.
Ratio
No.
No, it is a ratio scale.
It is ratio.
interval
interval
ratio
interval
Nominal Scale < Ordinal< Interval < Ratio
A group, as a single entity, would be nominal.
Ratio. It has a true zero.
Ordinal.
It is a ratio scale of measurement.