Identify each of the following as examples of (1) nominal, (2) ordinal, (3) discrete, or (4) continuous variables:
a. A poll of registered voters as to which candidate they support
b. The length of time required for a wound to heal when a new medicine is being used
c. The number of televisions within a household
d. The distance first-year college women can kick a football
e. The number of pages per job coming from a computer printer
f. The kind of tree used as a Christmas tree