Identify each of the following as examples of (1) attribute (qualitative) or (2) numerical (quantitative) variables.
a. Scores registered by people taking their written state automobile driver’s license examination
b. Whether or not a motorcycle operator possesses a valid motorcycle operator’s license
c. The number of television sets installed in a house
d. The brand of bar soap being used in a bathroom
e. The value of a cents-off coupon used with the purchase of a box of cereal