Final answer:
The level of measurement for the given variable is ordinal, as it can be ordered but the differences between the values cannot be measured.
Step-by-step explanation:
The level of measurement for the variable 'Time of day measured in military time: 1800, 1900, 2000, 2100, and 2200' is Ordinal.
An ordinal scale level data can be ordered, but the differences between the values cannot be measured. In this case, the military time can be ordered from earliest to latest, but the differences between the times do not have meaningful measurements.